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Posted by on Thursday, August 19, 2010 at 12:41am.

You drop a ball from a height of 2.0 m and it bounces back to a height of 1.5 m (a) What fraction of its initial energy is lost during the bounce? (b) What is the ball’s speed just at it leaves the ground after the bounce?

  • physics - , Thursday, August 19, 2010 at 2:30am

    (a) 1/4
    (b) sqrt(3/4)*sqrt(2gH)
    where H = 2.0 m
    You could also write it as sqrt(2gH'), where H' = 1.5 m is the distance it rises after the first bounce

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