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Homework Help: Elastic Collision

  1. Nov 11, 2011 #1
    1. The problem statement, all variables and given/known data

    An object of 2kg moving at 3m/s hits a 4 kg stationary object, causing the stationary object to begin moving at 0.5m/s. How fast is the original object now travelling?

    It is an elastic collision.

    2. Relevant equations

    Not really sure, 1/2mv^2 I presume.

    3. The attempt at a solution

    None so far, i'm stuck on it and am not sure how to approach it.
  2. jcsd
  3. Nov 11, 2011 #2
    What principle can be used in a collision?
  4. Nov 11, 2011 #3
    Namely, what quantity involves mass and velocity, so we can use all your given data? What can we say about its value before and after the collision?
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