A train is moving along a track with constant speed v1 relative to the ground. A person on the train holds a ball of mass m and throws it toward the front of the train with a speed v2 relative to the train.

Part A

Calculate the change in kinetic energy of the ball in the Earth frame of reference.

Express your answer in terms of the variables m, v1, and v2.

Part B

Calculate the change in kinetic energy of the ball in the train frame of reference.

Express your answer in terms of the variables m, v1, and v2.

Part C

How much work was done on the ball in the Earth frame of reference?

Express your answer in terms of the variables m, v1, and v2.

Part D

How much work was done on the ball in the train frame of reference?

Express your answer in terms of the variables m, v1, and v2.

Explanation:

velocity of ball in train reference = v2

velocity of ball in earth reference = v1+v2

(a)

Kinetic energy is given by where m and v are the mass and velocity of object respectively.

Change in kinetic energy is given by subtracting initial kinetic energy from the final kinetic energy. In this case

Initial kinetic energy=

Final kinetic energy=

Change in kinetic energy=

(b)

Change in velocity in train reference will be

Initial kinetic energy=

Final kinetic energy=

Change in kinetic energy=

(c)

Work done, W = change in kinetic energy=

(d)

Work done, W = change in kinetic energy=

12000j is work done

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.