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Homework Help: Finding Total momentum of a system

  1. Jun 13, 2012 #1
    1. The problem statement, all variables and given/known data

    A 2.2-kg cart is rolling along a frictionless, horizontal track towards a 1.0-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts collide, the first cart's velocity is +4.3 m/s, and the second cart's velocity is -1.1 m/s.*(a)*What is the total momentum of the system of the two carts at this instant?*(b)*What was the velocity of the first cart when the second cart was still at rest?

    2. Relevant equations


    3. The attempt at a solution

    So I found the momentums of each individual cart, (p1=9.5N and p2=-1.1N), do I just add the two values for the total momentum of the system? As in: 9.5N + -1.1N = 8.4 N

    Thank you
  2. jcsd
  3. Jun 14, 2012 #2
    edit: nevermind, to find the total momentum yes you just them together
    Last edited: Jun 14, 2012
  4. Jun 14, 2012 #3
    Thank you very much.
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