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A smooth sphere of mass M moving with velocity u directly collides elastically with another sphere of mass m at rest. After collision their

A smooth sphere of mass M moving with velocity u directly collides elastically with another sphere of mass m at rest. After collision their final velocities are V and v respectively. The value of v is- 2uM m (a) (b) 2um M (c)- 2u 1+ m M (d) 2u M m 1+-

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