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Why does the power have to be found at the bottom of a loop?

  1. Dec 15, 2016 #1
    1. The problem statement, all variables and given/known data
    For my physics class in high school we used cardstock to make a roller coaster and rolled a marble down it. Here is one of the questions I can't seem to figure out.

    Why does the power have to found at the bottom of the loop? Explain in terms of both energy and velocity.

    2. Relevant equations


    3. The attempt at a solution
     
  2. jcsd
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