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Calculate the gravitational potential energy of the child-Earth system

  1. Oct 12, 2009 #1
    1. The problem statement, all variables and given/known data
    A 32.2 N child is in a swing that is attached to ropes 1.65 m long. Calculate the gravitational potential energy of the child-Earth system relative to the child's lowest position when the ropes are horizontal


    2. Relevant equations
    GPI=mgy
    Ke= 1/2 m v^2
    3. The attempt at a solution
    0+.5mv^2= mgy + 0
    i think im on the right track but i dont seem to get the right answer
     
  2. jcsd
  3. Oct 12, 2009 #2

    Delphi51

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    Homework Helper

    Just use GPI=mgy where y = 1.65 m.
     
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