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Loop-the-loop potential energy and energy conservation

  1. Nov 3, 2009 #1
    1. The problem statement, all variables and given/known data
    a toy race car of mass m is released from rest on the loop-the-loop track. if it is released at a height 2R above the floor, how high is it above the floor when it leaves the track, neglecting friction?
    (the radius of the loop is R)

    2. Relevant equations
    E=K+U


    3. The attempt at a solution
    there is not initial KE and no final KE
    initial PE is mg2R and final PE is mgh
    I just can't seem to put it all together, does this mean h=2R as well?
     
  2. jcsd
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