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Homework Help: 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

    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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