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Thread: collision

  1. #1
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    collision

    A smooth sphere P, of mass m kg, moving with speed 5u m/s collides directly with a smooth sphere Q, of mass 2m kg, moving towards each other with speed 2u m/s.
    The coefficient of restitution between the spheres is e.
    find the condition satisfied by e if the 2 spheres move in the same direction after the collision.

    using the 2 normal equations i got their final speeds to be 3u-2ue and 3u-ue
    because they move in the same direction i let 3u-2ue >0 and 3u-ue>0
    solving these i get e<3 and e>3/2
    the answer at the back of the book is e<1/14
    i can go though my answer in more detail if you need it
    thanks
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  2. #2
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    Re: collision

    any helping information at all?
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