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## Homework Statement

My son is doing a science project - his theory is as follows:

*When a tennis ball is dropped from a low height, it usually bounces back at a rate approximately 2/3 the height of the initial drop. As the height of the initial drop increases, the bounce-back height ratio of the ball begins to decrease.*

I believe that the force of gravity will continue to decrease the tennis balls rebound height to the point where the ball will eventually reach a maximum elevation of recoil.

I believe that the force of gravity will continue to decrease the tennis balls rebound height to the point where the ball will eventually reach a maximum elevation of recoil.

I'm not looking for anyone to support or deny his hypothesis, just some help on where we can look for research information to help him with his project. We've no idea what "label" to put on this hypothesis - what theories are used to prove or disprove, etc. Can anyone help, please?