question_answer

A particle of mass m moving with a velocity \[\vec{V}\] makes a head on elastic collision with another particle of same mass initially at rest. The velocity of the first particle after the collision will be    [MP PMT 1997; MP PET 2001; UPSEAT 2001]

A)          \[\vec{V}\]                    

B)          \[-\vec{V}\]

C)          \[-2\vec{V}\]                 

D)          Zero