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A ball of mass m is projected with a spe...

A ball of mass `m` is projected with a speed `v` into the barrel of a spring gun of mass `M` initially at rest lying on a frictionless surface. The mass sticks in the barrel at the point of maximum compression in the spring. The fraction of kinetic energy of the ball stored in the spring is

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The correct Answer is:
`[(M)/(m+M)]`
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