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A particle of mass m moving with velocit...

A particle of mass m moving with velocity `u_(1)` collide elastically with another particle of same mass moving with velocity `u_(2)` in the same direction. After collision their speeds are `v_(1)` and `v_(2)` respectively then
(A) `u_(1)+v_(1)=v_(2)+u_(2)`, (B) `u_(1)-v_(1)=v_(2)+u_(2)`

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