A rocket is launched straight up with constant acceleration. Five seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 10.0 s later. What was the rocket's acceleration?

A 10-cm-wide opening leading into an evacuated chamber is covered with a circular 20-cm-diameter lid. It exerts a 638 N force.

20 kPa is the chamber's pressure. The formula for calculating the required force is Force = difference in pressure x area of plate.

[tex]$F=\left(P_2-P_1\right) \times A \ldots$$F=\left(P_2-P_1\right) \times \pi r^2$$P_1=20000 \mathrm{~Pa}$$P_2=101325 \mathrm{~Pa}$$r=0.05 \mathrm{~m}$[/tex]

Now adjust equation (1) to reflect the new values, and calculate

[tex]$F=(101325-20000) \times 3.14 \times(0.05)^2=638 \mathrm{~N}$[/tex]

638 N of force is required.

The numbers from each of these observations and calculations should be entered into the primary equation, F = pA, where F is the piston force (F) in newtons (N), p is the gauge pressure, and A is the complete bore area.

An object's speed, direction of motion, or shape can all be altered by applying a force to it. A measurement of the force operating on a region is called pressure. The formula pressure = force / area can be used to calculate pressure. A force will therefore exert higher pressure while working across a smaller region.

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The force necessary to lift an object is the same as the force necessary to fight gravity.

We may calculate the gravitational force acting on the object using Newton's second law if we assume that the acceleration caused by gravity is 9.8ms2. By exerting force that is produced by the person's muscles, the weights are raised. It is therefore a muscular force. Lift can be in any direction with respect to gravity, contrary to the popular understanding of the word, which defines it with respect to the direction of flow rather than the direction of gravity. If the force on an object's bottom is greater than the force of gravity coming from above, lift will result. Lift must equal gravity for a height to be sustained.

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The spring and pan have very little mass. The mass executes a SHM when it is lightly squeezed and then released.

Forces, location, velocity, and energy—both kinetic and potential energy—are some examples of these quantities. Hoare's Rule. Energy conservation: When the compressed spring returns to its natural length, all of the energy that was stored in it is transformed into kinetic energy. The block is propelled along a horizontal surface as the spring is let go. Friction and the spring's bulk can be disregarded. Between two blocks with masses of 1 kg and 2 kg that are lying on a smooth horizontal surface is a compressed elastic spring. The block is freed from rest once the spring has been compressed by 2.0 cm.

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Answer:

Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.

When the filament breaks in one lamp in a parallel circuit, lamps in other branches of the circuit normally continue glowing as brightly.

There are precisely two sets of electrically common points formed by the connections of all parts across one another. A path for electrical current created by one of the load components is referred to as a "branch" in a parallel circuit (such as a resistor).

The fact that it is all connected in parallel sequences, hence the name, is a crucial component of the "parallel" circuit. The "rungs" on either side of this sort of circuit must be descended for a current to pass through each component.

Aparallel circuit's characteristics :

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The correct statement for the above question is the Climate change is a logical outcome of global warming.

"Global warming" refers to the observed, century-scale rise in the average temperature of the Earth and its effects. Heat is absorbed and radiated by the build-up of greenhouse gases in the earth's atmosphere, including ozone, carbon dioxide, methane, and nitrous oxide. It is possible to alter the amounts of greenhouse gases in the atmosphere to either trap or release more solar heat. Climate change refers to significant, ongoing changes in the global climate. The world's climate is influenced by the sun, the earth, the oceans, wind, rain, snow, forests, deserts, savannas, and human activity. For instance, the yearly temperature changes, rainfall, and other characteristics of New York's climate can be used to describe it. The "average" of the climates in various places, however, is less extreme than the global climate.

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carbon fibers and epoxy resin have respective tensile strengths of 70, 350, and 3.5 GPa. According to these estimates, fibers are particularly effective at increasing the composite modulus in the longitudinal direction.

(a)  [tex]V_{f}[/tex]=[tex]A_{f} /A_{c}[/tex]  ,[tex]V_{m} =A_{m}/A_{c}[/tex]

The elastic modulus of the composite is given by

E[tex]_{c}[/tex]=[tex]E_{f} V_{f} +E_{m} V_{m}[/tex]

E[tex]_{c}[/tex]/E[tex]_{m}[/tex]=([tex]E_{f} /E_{m}[/tex] - 1) [tex]V_{f}[/tex]+1

the calculation will give the following result

System([tex]E_{f} /E_{m}[/tex])  [tex]V_{f}[/tex]=10%  [tex]V_{f}[/tex]=50%

Glass – epoxy(20)   2.9            10.5

Carbon epoxy (100) 10.9    50.5

(b)  50 It has been found that as the volume fraction of fiber grows by a factor of 5, the ratio (E[tex]_{c}[/tex]/E[tex]_{m}[/tex]) similarly increases by a corresponding amount (3.62 for glass epoxy and 4:63 for carbon epoxy )

Additionally, as the fiber modulus increases by a factor of 5, the ratio of  (E[tex]_{c}[/tex]/E[tex]_{m}[/tex]) increases by a comparable factor (3.7 at  [tex]V_{f}[/tex]=10% and 4.81 at [tex]V_{f}[/tex] =50%). These calculations demonstrate that fibers are particularly successful in raising the composite modulus in the longitudinal direction.

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According to the given statement 414 nm is the value of the unknown wavelength.

The distance between two wave crests, which also applies to troughs, is known as the wavelength. Cycles per second (Hz), the number of vibrations that pass across a certain region in a second, is used to measure frequency (Hertz). The link between wavelength and frequency is discussed in this article.

For third order maxima,

asinθ  = mλ

asinθ = 3 * 690

The slit width in this instance is a, and the angular spacing is.

The fifth order maximum, meanwhile

asinθ = mλ

asinθ = 5λ

Solving as,

5λ = 3 * 690

λ = 414 nm

Therefore, 414 nm is the value of the unknown wavelength.

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The following vectors best describes the path of the airplane Aniseed of the as plan is 528 [tex]\mathrm{mi} / \mathrm{hr}[/tex]

What is airplane?

A fixed-wing aircraft that is pushed forward by the thrust of a jet engine, propeller, or rocket engine is known as an aeroplane or aeroplane. There are many different sizes, forms, and wing arrangements for airplanes.

[tex]\text { bearing } 25^{\circ} \text { west of north }[/tex]

[tex]\text { Since } \quad 90^{\circ}+25^{\circ}=115^{\circ}[/tex]

[tex]\text { so path of the airplane is }[/tex]

[tex]\left.v=528 \cos \left(i 15^{\circ}\right) i+528 \sin \left(115^{\circ}\right)\right][/tex]

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A roller coaster starts from rest at point  is option C) the kinetic energy of the coaster at C will be equal to its potential energy at A.

Since Two objects are sliding at the same speed across a wooden surface. The  distance traveled by the second object is option B) 2S

A person's weight measured in the elevator immediately after the elevator starts to fall is option E) zero A force F produces an acceleration a on an object of mass m.

The mass of the second object is option D) (3/8)m.

The amount of kinetic energy change and the amount of potential energy change are identical in all physical processes that take place in closed systems. When the kinetic energy rises, the potential energy falls, and vice versa.

Wave speed is the number of meters a wave travels in a second, or the distance a wave travels in a particular amount of time. Equation Speed = Wavelength x Frequency describes how wave speed relates to wave wavelength and wave frequency.

Therefore, When wavelength and frequency are known potential energy stored energy that depends on the relative positions of different components of a system may be utilized to compute wave speed—this equation can be used to determine wave speed. When stretched or squeezed, a spring has higher potential energy.

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Due to the pendulum's sluggish swing, which gave the impression of changing direction as the Earth moved away, the Foucault Pendulum demonstrated that the Earth rotates.

Foucault understood that his pendulum would swing more slowly the longer the thread was linked to the weight.

If he used a very heavy weight and the string above to a nearly frictionless pin, the pendulum would swing so slowly that it would seem to shift direction as the Earth moved away.

Foucault's pendulum revolves at the same speed as the Earth's rotation when they align at the poles. These axes are perpendicular to each other everywhere on the equator, therefore the pendulum is completely unaffected by the Earth's spin.

The first scientific proof of the Earth's rotation on its axis was the rotation of the plane of swing of Foucault's pendulums. There is relative motion between them as the Earth spins beneath a Foucault pendulum that swings back and forth in a plane.

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A lens with an 11 cm focal length is 22 cm to the left of a 1.8 cm tall object. The image's height has decreased by 0.25 pixels when a second lens with a focal length of -5cm is placed 37cm to the right of the first lens.

Let's determine the distance at which the image is formed from the first lens since the image of the first lens serves as a virtual object for the second lens. Use the lens manufacturer's formula:

1/o + 1/i = 1/f, where I am the image distance and o is the object distance,

1/i = 1/f - 1/o = 1/(11cm) - 1/(22cm) = 0.045 1/cm, so

i = 22cm

the virtual object for the second lens is left at a distance of 37 cm - 22 cm, or 15 cm, from the second lens. Utilize the lens manufacturer's formula once more:

1/i = 1/f - 1/o (This time, the object distance is the separation between the second lens and the virtual object.)

1/i = 1/(-5cm) - 1/(15cm) = -0.26 1/cm, so

i = -15/4cm away from the second lens.

The sum of the two magnifications from the two lenses is the total magnification: m = m1m2, where m = -i/o, so

m = (-22 cm/22 cm)( 15/4cm/15cm) = -0.25, Consequently, the image's height is 0.25 pixels shorter than it was before.

It is the inverse of the system's optical power that determines how strongly an optical system diverges or converges light: the focal length. The convergence or divergence of light is indicated by a positive focal length, whilst the opposite is true for a negative focal length.

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Combination of swimming and biking times that meets distance and the time constraints in this situation is s + b ≤ 2. An inequality that represents  number of gift items that Elena needs is : 3b+5n≤30.

If athletes train for not more than 2 hours a day, then the sum of the hours training swimming 'a' and biking 'b' should be less than or equal to 2. Hence, we can write the following inequality:

s + b ≤ 2

Inequality that represents Mai's statement is:

s + b ≤ 2

Part 2:

It is given that , bracelets cost $3, necklaces cost $5 and she can spend not more than $30

Then the inequality that represents the number of gift items that Elena needs :  3b+5n≤30

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In this case, we are given that the rod is subjected to the force system shown in the figure. There is a vertical force F acting on the rod at point A, as well as a horizontal force P. The rod is also subjected to a moment M about the z-axis.

To determine the stress components that act at point A, we need to consider the forces that are acting on a small volume element located at this point.

The stress on a volume element is defined as the force acting on the element per unit area. The stress components at a point can be represented by a stress tensor, which is a 3x3 matrix with nine elements. The diagonal elements of the stress tensor represent the normal stress components, while the off-diagonal elements represent the shear stress components.

To determine the stress components at point A, we need to consider how these forces are distributed over the surface of the volume element. The normal stress components can be found by considering the forces acting perpendicular to the surface of the element. The shear stress components can be found by considering the forces acting tangent to the surface of the element.

For example, the normal stress component in the x-direction at point A can be found by considering the force F acting perpendicular to the surface of the element in the y-direction. The normal stress component in the y-direction at point A can be found by considering the force P acting perpendicular to the surface of the element in the x-direction. The shear stress component in the XY-plane at point A can be found by considering the moment M acting tangent to the surface of the element.

To determine the specific values of the stress components, we would need to know the dimensions of the volume element, as well as the magnitudes of the forces and moments acting on the rod. With this information, we can use the equations of statics to solve for the stress components at point A.

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(A) With 268.94 N tension must she stretch it.

26% increase in tension is needed to increase the frequency from 65.4 Hz to 73.4 Hz, corresponding to a rise in pitch from C to D.

Part (A)

Fundamental frequency =f0= 65.4 Hz.

The length of the vibrating portion of the string = l = 0.615 m

Mass= m = 14.8 g

We know, [tex]f_0 = \frac{v}{2l}[/tex]

So, the value of v will be 65.4*2*0.615 = 80.442 m/s

As, We know,

[tex]T=\frac{v^2}{\frac{m}{l}}[/tex]

So, the value of tension will be: [tex]\frac{80.442^2}{\frac{14.8}{0.615}}=\frac{6470.91}{24.06}=268.94\:N[/tex]

Part (B)

Fundamental frequency =f0= 73.4 Hz.

The length of the vibrating portion of the string = l = 0.615 m

Mass= m = 14.8 g

We know, [tex]f_0 = \frac{v}{2l}[/tex]

So, the value of v will be 73.4*2*0.615 = 90.282 m/s

As, We know,

[tex]T=\frac{v^2}{\frac{m}{l}}[/tex]

So, the value of tension will be: [tex]\frac{90.282^2}{\frac{14.8}{0.615}}=\frac{8150.8395}{24.06}=338.77\:N[/tex]

So, the percentage increase in tension will be [tex]\frac{338.77-268.94}{268.94}\times 100\%=25.96\% \approx 26\%[/tex]

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The complete question should be:

a cellist tunes the c-string of her instrument to a fundamental frequency of 65.4 hz. the vibrating portion of the string is 0.615 m long and has a mass of 14.8 g .

Part A: With what tension must she stretch it?

Part B

What percent increase in tension is needed to increase the frequency from 65.4 Hz to 73.4 Hz, corresponding to a rise in pitch from C to D?

Option B is Correct

The velocity of the center of mass remains constant before the collision, when they collide there is a slight decrease in kinetic energy of the system since the collision is inelastic, resulting in a slight decrease of velocity, afterwards the velocity is constant again.

Velocity is the directional velocity of a moving object, observed from a given frame of reference and indicating the rate of change of position measured at a given time reference (eg 60 km/h northward). Velocity is a fundamental concept in kinematics, a branch of classical mechanics that describes the motion of bodies.

Velocity is a physical vector quantity. Both magnitude and direction are required to define it. The scalar absolute value (magnitude) of velocity is called velocity, and its magnitude is a consistent derived unit measured in the SI (metric) system as meters per second (m/s or m⋅s−1). For example, " meters/second" is a scalar, but "5 meters/second east" is a vector. An object is said to be accelerating if its velocity, direction, or both change.

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Answer:

amplitude:1m

period:10s

Explanation:

The unit vector of the second force is [tex]\frac{-32i-12.3^1/2}{38.16}[/tex], and its magnitude is 38.16N and the angle is 147 with a positive x-axis.

According to the question

a= 12m/s^2

m=2kg

F=24N

Fx= Fsin30 = 24.1/2=12

   = 12(-i)

Fy= Fcos30 = 12√3N

   = 12√3(-j)

F=-12i-12√3j

F1=20j,        F2=F-F1= -32i-12√3j

                  F2=38.16N

(a) Unit vector = [tex]\frac{F2}{|F2|}[/tex] =[tex]\frac{-32i-12.3^1/2}{38.16}[/tex]

(b)Magnitude= 38.16N

(c) Angle= [tex]tan^{-1}[/tex][tex]\frac{y}{x}[/tex] = 33 means 33 with - x axis. so with the + x-axis it will be 180-33= 147

Therefore

The unit vector of the second force is [tex]\frac{-32i-12.3^1/2}{38.16}[/tex] and its magnitude is 38.16N and the angle is 147 with a positive x-axis

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Wavelength of the following parameters, if any, will be different in the two strings.

The distance between two wave crests, which also applies to troughs, is known as the wavelength. Cycles per second (Hz), a unit of measurement for frequency, is the number of vibrations that pass through a certain space in a second (Hertz). The link between frequency and wavelength is discussed in this article.

The formula for the wave's speed on the string is

[tex]$v=\sqrt{\frac{T}{\mu}}$[/tex]

Here, mu stands for mass per unit of length and T for string tension.

The mass per unit length varies depending on the thickness. As a result, the wave speed varies between the two strings.

The oscillator determines the frequency of the oscillations. As a result, using the same oscillator, the frequency is the same for the two strings.

In terms of frequency and speed,

f= γλ

λ= f/γ

The wavelength of the waves varies as the speeds vary since the frequency is constant.

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The amplitude is 0.25s.

Calculation:

Amplitude = A = 0.225 m

Angular frequency = w = 8π rad/s.

Frequency = f = w/2π = 8π/2πHZ = 4 HZ

Time period = T = 1/f = (1/4)s = 0.25s.

The maximum displacement or distance traveled by a point on an oscillating body or shaft, measured from the equilibrium position. This corresponds to half the length of the vibration path. Amplitude difference between a rest position and maximum shaft deflection.

Frequency The number of waves passing a particular point per second. Duration  How long it takes for a wave cycle to complete. Sound wave amplitude is a measure of wave height. The amplitude of a sound wave can be defined as the magnitude or loudness of the maximum displacement from the average position of the vibrating particles in the medium when the sound was produced.

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When the gymnast starts to jump his potential energy starts to convert to kinetic energy. But when he reaches the maximum height and stop there for seconds, potential energy regains. Thus, option C is correct.

Potential energy of an object is the energy stored in it by virtue of its position. Potential energy increases with increases in mass and height which is clear from the equation for potential energy

p = mgh

Kinetic energy is generated by motion of the object. Thus, only a moving body attains a kinetic energy. Kinetic energy depends on the mass and velocity of the object.

Here, the gymnast gains a kinetic energy when he starts to jump from rest. But, when he reaches the maximum height where the speed slows down, his kinetic energy converts to potential energy. Thus, option C is correct.

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Your question is incomplete. But your complete question probably was:

A gymnast uses a flexible stick to jump over the bar. Which of the following

describes energy changes when he reaches the highest point of his jump?

A) kinetic- potential- potential

B) kinetic- potential- kinetic

C) potential - kinetic – potential

D) potential- potential- kinetic

(a) The angular speed of the new system is 2.455 rad/s.

(b) The angular speed of the new system is 1.64 rad/s.

(a) The Angular Momentum Conservation Principle is observed since there are no outside forces acting on either disk.The fact that the axes of rotation of each disk coincide allows for the principle to be reduced to its scalar version. The ratio of the inertial moment to the angular speed determines the angular momentum's size. The moment of inertia doubles and the angular speed is cut in half as soon as both disks start to revolve.

It is given by, I ω₀ = 2* I * ωf

Where,

I - Moment of inertia of a disk, measured in kilogram-square meter

ω₀ - Initial angular speed, measured in radians per second

ωf - Final angular speed, measured in radians per second

The expression for relating final angular speed to initial angular speed is,

ωf = 1/2 * ω₀

Given that, ω₀ = 4.91 rad/s

The new system's angular speed is,

ωf = 1/2 * 4.91 = 2.455 rad/s

(b) If third such disk is dropped on the first two, the expression on angular velocity becomes,

I ω₀ = 3* I * ωf

ωf = 1/3* ω₀ = 1/3* 4.91 = 1.64 rad/s.

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(A) A toroidal solenoid has 1855 turns.

(B) The rate of current is across it is 1142.86 A/s.

(A) A solenoid is a machine made of a casing, a coil of wire, and a moving plunger. The plunger is drawn in by the magnetic field that forms around the coil when an electrical current is delivered. Simply put, a solenoid converts electrical energy into mechanical work.

Given,

Length l = 2πr = 2× π × 0.054 = 0.34 m

L = μ₀ N² A/l

Making N as subject, we have,

N = √[(L* l)/(μ₀ A)]

N = √[(2.8 * 10⁻³* 0.34)/(4π* 10⁻⁷* 2.2* 10⁻⁴)

⇒ √[(0.952* 10⁸)/27.65] = 10⁴ * √(0.952/27.65) = 1855

N= 1855 turns

B) V = L dl/dt

dl/dt = V/L = 2.4/(2.8* 10⁻³) = 857.14 A/s

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Particles can exist in classically forbidden regions outside the finite square-well potential.

The correct option is D.

In the absence of quantum effects, everything would be continuous, smooth, and completely predictable in the Newtonian sense. However, we may not be here to get bored with this if Planck's constant were 0.

At the atomic scale, the behavior of both particles and waves is described by Planck's constant. One of the factors that led to the creation of quantum mechanics is Planck's constant. It was a surprise when those boundaries also turned to represent the limits where known rules of physics applied since the Planck scaled was developed as an universal set of units.

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The degeneracies of the first, fourth and fifth energy levels for the three dimensionsal cubical box are 1, 3 and 1.

Calculation :

Given Data

A three-dimensional cubic box with

lx=ly=lz=Li.

For a 3D cubic box, the energy of the particle in a box is having a formula given below,

E3D=h²8m(n²x/l²x+n²y/l²y+n²z/l²z)

Given,

lx=ly=lz=Li, put in the above equation, we get,

E3D=h²/8m(n²x/L²+n²y/L²+n²z/L²)

E3D=h²/8mL²(n²x+n²y+n²z)

Now, for the First energy level, the energy will be,

E3D=h²/8mL²(1²+1²+1²)

E3D=3h²/8mL²

The degeneracy is equal to 1 because nx=ny=nz=1.

Now, for the Fourth energy level, the energy will be,

E3D=h²/8mL²(1²+1²+3²)

E3D=h²/8mL²(1+1+9)

E3D=11h²8mL²

The degeneracy is equal to 3 because, nx=1,ny=1,nz=3,nx=1,ny=3,nz=1 and nx=3,ny=1,nz=1.

Now, for the Fifth energy level, the energy will be,

E3D=h²/8mL²(2²+2²+2²)

E3D=h²/8mL²(4+4+4)

E3D=12h²/8mL²

The degeneracy is equal to 1 because nx=2,ny=2,nz=2.

Therefore, the degeneracies of the first, fourth and fifth energy levels are 1, 3 and 1.

Energy levels are degenerate if they correspond to two or more different measurable states of a quantum system. Conversely, two or more distinct states of a quantum mechanical system are said to be degenerate if they have the same energy value when measured. The number of different states corresponding to a particular energy level is called the degeneracy of the level.

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There are two girders and 5 beams Each beam spans between two girders. The tributary area of rim  joist is  864ft²

Length of the rim joist = Y ft = 36ft

Length of each bay out of 4 = X/4 = 96/4 = 24ft

Tributary width of rim joist is half on each bay to its side

Tw = 24/2 + 24/2 = 24

Tributary area Ta = tw × length

Ta = 24 × 36 = 864ft²

The floor or roof area (in plan) that results in loading on a certain structural element is known as the tributary area. In each direction, name the adjacent column.

the distance between the two, measured.

multiplying by two the distance

From here, create a perpendicular line.

Repeat until a bounding polygon appears for each gridline that is close by.

A beam's tributary area is equal to its length times the addition of half its space to each adjacent girder.

The square footage of the deck surface area supported by one post is known as the tributary area. Depending on how the deck is set up, this can differ for each post.

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If two metal blocks of different masses slide freely down the same frictionless incline, option a is correct.

Objects accelerate due to imbalanced forces. However, not every item accelerates at the same rate in the presence of the same imbalanced force. As a result, the speed and net force in the direction perpendicular to the plane must both be zero. Since the plane is assumed to be "frictionless," no force is applied to the block that is perpendicular to the surface by the plane. The acceleration is determined by multiplying the acceleration of gravity by the sine of the angle for a frictionless incline of angle degrees. The force of gravity is not parallel to the surface when there is an inclination. The normal force diminishes as the angle of the incline increases, which reduces the frictional force. You can increase the inclination until the thing barely starts to slip.

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If A + B = 0, then the magnitude of B is equal to the magnitude of A. This is because the magnitude of a vector is simply its size or length, and if two vectors add up to zero, then their magnitudes must be equal.

As for the direction of B, it is the opposite of the direction of A. This is because if two vectors are equal in magnitude and opposite in direction, their sum will be zero. For example, if A is a vector pointing to the right and B is a vector pointing to the left, their sum will be zero. Similarly, if A is a vector pointing upwards and B is a vector pointing downwards, their sum will also be zero.

In summary, if A + B = 0, then the magnitude of B is equal to the magnitude of A, and the direction of B is opposite to the direction of A.

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Initial current via the inductor is lo = 0, and initial charge at the capacitor is Q-o = 3.2 C. The only two devices allowed by the loop rule.

Find the current (sign included) flowing through the inductor at the point t = 2.2 seconds using the loop rule and the differential equation derived for an LC circuit. Derive the differential equation for an LC circuit using the loop rule. To improve comprehension of complex concepts in electrical circuit analysis, such as inductance, capacitance, and reactance, By building up electric charges on two nearby surfaces, a capacitor is a device that stores electrical energy in an electric field. An RL circuit is one with resistance and self-inductance, and an RL circuit with a resistor.

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a. The speed of the train after 5s is 28.1m/s

b. The distance traveled by the train after 5s is 120m

The impulse of an object is the rate of change of momentum. Momentum is the product of mass of an object and it's velocity.

therefore the change in momentum = mv - mu.

Impulse is also the product of the force and time.

therefore impulse = ft

ft = mv -mu

8.1×10⁶ ×5 = 5×10⁶(v- u)

divide both sides by 5×10⁶

v-u = 8.1

v-20 = 8.1

v = 20+8.1 = 28.1m/s

therefore the speed of the train after 5s is 28.1m/s

from f = ma

a = (8.1×10⁶)/5×10⁶

a = 1.62m/s²

from s = ut+½at²

S = 20×5+½×1.6×25

S = 100+20

S = 120m

therefore the distance traveled by the train after 5s is 120m.

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