question_answer

A ball of mass m moving with velocity V, makes a head on elastic collision with a ball of the same mass moving with velocity 2V towards it. Taking direction of V as positive velocities of the two balls after collision are       [MP PMT 2002]

A)          \[-V\] and \[2V\]

B)                       \[2V\]and \[-V\]

C)          V and\[-2V\]

D)                       \[-2V\] and \[V\]