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When a tennis ball bounces it loses some energy. How much energy or height is lost per bounce?

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  • $\begingroup$ Well, what do you think? Are you familiar with the "coefficient of restitution"? Check out the Wikipedia article. $\endgroup$ – Bob D Sep 12 '19 at 19:27
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    $\begingroup$ It depends on which brand of tennis ball. Drop a tennis ball from some height and measure how high it bounces up. That fractional height is the same as the fractional energy it still has. $\endgroup$ – G. Smith Sep 12 '19 at 19:47
  • $\begingroup$ Less than silly-putty and more than a lacrosse ball? $\endgroup$ – Jon Custer Sep 12 '19 at 21:42
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Measure it! Drop a tennis ball from $1$ meter and then measure as close as possible the height of its bounce. Use the simple potential energy of near Earth gravity $V=mgh$ to find what percentage of energy remained on the bounce. You can try various initial heights to see if that scale proportionately.

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