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Bouncing ball HWK help

  1. Apr 13, 2009 #1
    1. The problem statement, all variables and given/known data
    If the ball is dropped from a height of 1.5 m, how much of the potential energy, in joules, is retained
    after the first bounce on the carpet?
    the mass of the ball is 500g


    2. Relevant equations

    Eg = mgh
    Ek = 1/2mv2
    v = (2gh)-2

    i think that all i need

    3. The attempt at a solution
    Ek which is (.5kg)(9.8)(1.5M) So the EK energy exerted is 7.5J? but my teachers answer says its 4.9 :( im so confused help
     
  2. jcsd
  3. Apr 14, 2009 #2

    LowlyPion

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    Homework Helper

    It drops from 1.5m. But how high does it bounce? Isn't the height attained after the first bounce the height you need to answer the question?
     
  4. Apr 14, 2009 #3
    it bounces elastically?
    i think some info is missing...
     
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