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    (See attachment for diagram - well a very poor diagram.) An elastic collision occurs as shown. Prove that, if M>m, then \beta<\frac{\pi}{2}.

    I have equations for the conservation of energy, and conservation of momentum in both the x- and y-directions, but can't find a way to relate M, m and \beta, which I would have though was the way to solve it.


    EDIT: Would probably help if I uploaded the diagram haha
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