There is conversion of energy from potential to kinetic energy during rebound.
What is energy change?
The term energy refers to the ability to do work. Now we know that energy changes occur as a ball moves from one point to another. This is accordance with the law of energy conservation which states that energy can not be created nor destroyed but is converted from one form to another.
Now given that the ball while at a given height has only potential energy. This is converted to kinetic energy when the ball is dropped from a height. The energy coverts to potential energy again at the maximum height during rebound.
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