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Physics question Energy Problems with a loss

  1. Feb 23, 2016 #1
    1. The problem statement, all variables and given/known data
    This is a simple question but I can't seem to solve it( I don't know if this is advanced physics or not first time on this website, it said Work and that is part of this energy loss problem) here is the problem: What percentage of its gravitational potential energy does a squash ball lose if it falls from 3.0 m and returns to a height of .076 after bouncing once?

    2. Relevant equations
    (100-x)(Ek1 + Eg1)/100 = Ek2 + Eg2
    Ek = 1/2mv²
    Eg = mgh

    3. The attempt at a solution
    Honestly, my Teacher did not give any example on a question with no "x" variable like this one, so literally I had no clue on how to attempt this question.
  2. jcsd
  3. Feb 23, 2016 #2


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    Staff: Mentor

    Welcome to the PF.

    You would just compare the E=mgh values of PE for the start and end positions of the ball. But what does "to a height of 0.076" mean? 0.076 meters, or 0.076*3.0 meters?
  4. Feb 23, 2016 #3
    Thanks !

    Its H1= 3.0 m and H2= .076, I know that for sure because, the ball is first at 3.0 M then it bounces and reaches a height of .076m. thats all i got from the question, oh and g= 9.80.
  5. Feb 23, 2016 #4


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    Staff: Mentor

    So all you have to do is calculate the two mgh values, and figure out what percentage of the original PE was lost in the bounce. :smile:
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