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Women Jumping Off Flatcar

  1. Oct 22, 2006 #1
    N women, each with mass m, stand on a railway flatcar of mass M. Tehy jump off one end of the flatcar with velocity u relative to the car. The car rolls in the opposite direction without friction.

    A- What is the final velocity of the flatcar if all the women jump at the same time?

    B- What is teh final velocity of the flatcar if they jump off one at a time? (The answer can be left in the form of a sum of terms)
     
  2. jcsd
  3. Oct 22, 2006 #2

    radou

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    Use conservation of momentum.

    P.S. Why women? Is it supposed to encourage creativity? :biggrin:
     
  4. Oct 22, 2006 #3
    I know that it's conservation of momentum, but I don't know how to set up the starting equations or how to apply it.
     
  5. Oct 22, 2006 #4

    radou

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    Hint: look at the women and the platform as a system. What is the initial momentum of the system? What is the final momentum of the system? In what relation must they be?
     
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