Net Work & Kinetic Energy Video Lessons

Concept

# Problem: 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.Calculate the change in kinetic energy of the ball in the Earth frame of reference.Calculate the change in kinetic energy of the ball in the train frame of reference.How much work was done on the ball in the Earth frame of reference?How much work was done on the ball in the train frame of reference?

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###### Problem Details

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.

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

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

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

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