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How do i find change in kinetic energy?

Here is the problem:

The rubber ball is dropped 2m elastically off the floor, so its speed immediately after bouncing is the same as immediately b4.

If the rubber ball has a mass of 0.015kg and its velocity is 6.26m/s, what is its change in kinetic energy from immediately b4 the collision to immediately after the collision? Breifly justify your answer.

Do i use this equation, KE = 1/2mv^2?

THANKS!!

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# Homework Help: Help on inelastic problem

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