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Two particles of masses m(1) and m(2) mo...

Two particles of masses `m_(1) and m_(2)` move with velocities `upsilon_(1) and upsilon_(2)` towards eachother on a smooth horizontal surface. What is the velocity of their centre of mass ?

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`overset rarr(v_(cm)) = (m_(1) overset rarr(v_(1)) + m_(2) overset rarr(v_(2)))/(m_(1)+ m_(2))`
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