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A Stick of length L and mass M lies on a...

A Stick of length L and mass M lies on a fnctionless horizontal surface on which it is free to move in any way. A ball of mass m moving with speed v collides elastically with the stick as shownin figure-5.115. If after the collision ball comes to rest, then what should be the mass of the ball ?

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The correct Answer is:
`[(Ml^(2))/(l^(2)+12d^(2))]`
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