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Change in momentum

  1. Jan 17, 2010 #1
    A runner of mass 65kg is running around a circular track at 5m/s. What is the magnitude of the change in his momentum from start to end after half a revolution?

    My answer if 650Ns, but the answer is written as 625Ns.
     
  2. jcsd
  3. Jan 17, 2010 #2
    I would say you are correct.
    The momentum changes from +325Ns to -325Ns
     
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