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Homework Help: Momentum of two-cart system

  1. Sep 23, 2015 #1
    1. The problem statement, all variables and given/known data
    A student runs an experiment with two carts on a low-friction track. As measured in the Earth reference frame, cart 1 (m = 0.57 kg ) moves from left to right at 1.0 m/s as the student walks along next to it at the same velocity. Let the +x direction be to the right.
    A. What velocity v⃗ E2,i in the Earth reference frame must cart 2 (m = 0.19 kg ) have before the collision if, in the student's reference frame, cart 2 comes to rest right after the collision and cart 1 travels from right to left at0.33 m/s?
    B. What does the student measure for the momentum of the two-cart system?

    2. Relevant equations
    p = mv

    3. The attempt at a solution
    A. v = 0 m/s

    B. p = m1*v1 +m2*v2
    p = (0.57 kg)(-0.33 m/s) + (0.19 kg)(0 m/s)
    p = -0.19 kg*m/s

    Do my answers look correct?
  2. jcsd
  3. Sep 24, 2015 #2


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    Science Advisor
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    Gold Member

    doesn't look right to me. Please post your working.
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