Posted by Sasha on Sunday, August 15, 2010 at 10:28am.
(a) It equals the fraction of the potential energy that is lost, at max weight. That looks like 1/4 in this case.
(b) To achieve 3/4 of the previous max height, you need the bounceback speed to be sqrt(0.75) = 0.866 of the speed just before inpact
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