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How far will the raft move (center of mass problem)?

  1. Nov 8, 2011 #1
    1. The problem statement, all variables and given/known data

    A 32 kg boy is standing on a 59 kg raft that is 8 m wide. He walks 6 m from a point 1.0 m from the left edge of the raft to a point 1.0 m from the right edge of the raft. If you ignore resistance of the water to the motion of the raft, how far does the raft move during this procedure

    2. Relevant equations

    x = (m1x1 + m2x2) / (m1+m2)

    3. The attempt at a solution

    x1 = (m1x1 + m2x2) / (m1+m2)
    x1 = (32(1) + 59(4)) / (91)
    x1 = 2.725

    x1 = (m1x1 + m2x2) / (m1+m2)
    x1 = (32(7) + 59(4)) / (91)
    x1 = 5.055

    x = 5.055 - 2.725
    x = 2.33m

    but it's wrong. anyone can help?
     
    Last edited: Nov 8, 2011
  2. jcsd
  3. Nov 8, 2011 #2
    nvm it was just a mis calculation, I got it now, thanks
     
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