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A particle of mass m with an initial vel...

A particle of mass m with an initial velocity `u hati` collides perfectly elastically with a mass 3 m at rest . It moves with a velocity `vhatj` after collision , then , v is given by :

A

`v=sqrt((2)/(3)) u`

B

`v=(1)/(sqrt(6))`u

C

`v=(u)/(sqrt(3))`

D

`v=(u)/(sqrt(2))`

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