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A wedge of mass M and angle alpha rests ...

A wedge of mass M and angle `alpha` rests on a smooth horizontal plane. A smooth sphere of mass m strickes it in a direction perpendicular to its inclined face and rebounds. If the coefficient of restitution is e, find the ratio of the speed of the sphere just before and just after the impact.

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The correct Answer is:
`(M+m sin^(2)alpha)/(eM-m sin^(2)alpha)`
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