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Momentum Elastic collision

  1. Mar 11, 2012 #1
    Mass of cart A: 1kg
    Mass of Cart B: 3Kg
    Spring potential energy: 24 Joules
    Two carts are pushed apart when the spring is released.
    Thats all the given and i'm suppose to find the final velocity.

    I have no idea how to get started.
    For me to use Es=(1/2)K*DeltaX^2, i don't have delta x or spring konstant.
    For me to use P=M*V, Mass is not give and i dont know the momentum.
    The only other equation i have i think that is related to this topic is the impulse equation. F*deltaT= Impulse
  2. jcsd
  3. Mar 11, 2012 #2
    When i drew the momentum bar graph, i set spring as the impulse so there was no momentum in beging but some at the end.
  4. Mar 11, 2012 #3
    Now i figured out using lol diagram that es would be equal to ek so then Ek=.5*m*V^2 and found the velocity not using the momentum. Anyone think what i did was wrong?
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