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Two bodies having masses m(1) and m(2) a...

Two bodies having masses `m_(1)` and `m_(2)` and velocities `v_(1)` and `v_(2)` colide and form a composite system. If `m_(1)v_(1) + m_(2)v_(2) = 0(m_(1) ne m_(2)`. The velocity of composite system will be

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