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Homework Help: Conversation of energy

  1. Mar 12, 2012 #1
    I attached the problem and the solution.

    The book uses V has potential energy and T as KE.

    I'm not quite sure how they did this problem. I was following it until the 2nd to last line of equations. where they have "8.829-11.772+1/2*6*v^2+0=0"
    Why don't they have the KE for the 4kg carriage? It looks like they said that was 0, but isn't that still moving too?

    Attached Files:

  2. jcsd
  3. Mar 12, 2012 #2


    User Avatar

    Staff: Mentor

    What freedom does it have to move when (at the instant) the links are inline?
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