Posted by **Anonymous** on Wednesday, October 19, 2011 at 10:59am.

A ball is dropped from the initial height h1 above the concrete floor and rebounds to a height of equal to 60% of the initial height h1. What is the ratio of the speed of the ball right after the bounce to the speed of the ball just before the bounce? This ratio is called coefficient of restitution e=v2/v1.

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