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Question

A sphere of mass m moving with a constant velocity u hits another stationary sphere of the same mass. If e is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be


A

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B

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C

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D

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Solution

The correct option is A


Let the final velocities of the two masses be v1 and v2 By definition, e=v2v104Conservation of linear momentum, m(u)+0=mv1+mv2v1+v2=4v1+v2v2v1=4e4v1+v2v1v2=1ev1v2=1+e1ev2v1=1e1+e


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