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Conservation of momentum for collision(q59)

  1. Nov 7, 2007 #1
    For the following problem:

    The answer is a.
    What I understand is: The momentum of a system of two particles is conserved when the system is isolated.

    Can anybody explain to me, why a is the correct answer?
  2. jcsd
  3. Nov 7, 2007 #2
    One way of finding out why option a is true, or why the others aren't, is to see what b,c,d and e would lead to, assuming they are correct.

    Remember, Force = dp/dt.
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