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    Louisa88's Avatar
    Louisa88 Posts: 9, Reputation: 1
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    #1

    May 7, 2010, 12:14 PM
    Question on Momentum
    A ball of mass m1, moving with speed v, collides with a stationary ball of mass m2. The first ball rebounds with speed 1/5 v, whereas the other moves off with speed 4/5 v in the direction of the original velocity of the first ball.

    1. Use the conservation of momentum to show that (m1/m2) = 2/3
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    May 7, 2010, 12:30 PM

    Set up an equation that equates the initial momentum with the final momentum:



    Note the negative sign - that's because m1 is moving in the negative directon after the collision. Now solve for m1/m2.
    Louisa88's Avatar
    Louisa88 Posts: 9, Reputation: 1
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    #3

    May 7, 2010, 12:52 PM

    Thanks a bunch ebaines :)

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