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Two particles of equal mass are moving a...

Two particles of equal mass are moving along the same straight line with the same speed in opposite direction. What is the speed of the centre of mass of the system ?

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`v_(cm)=(mv-mv)/(2m)=0`
Hint : `v_(cm)=(m_(1)v_(1)+m_(2)v_(2))/(m_(1)+m_(2))`
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