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A body of mass m 1 moving with an unknown velocity of i ˆ v 1 , undergoes a collinear collision with a body of mass m 2 moving with a velocity i ˆ v 2 . After collision, m 1 and m 2 move with velocities of i ˆ v 3 and i ˆ v 4 , respectively . If m 2 = 0.5 m 1 and v 3 = 0.5 v 1 , then v 1 is -

1. 4 v v 2 4 −
2. v 4 + v 2
3. 2 v v 2 4 −
4. v 4 – v 2

Correct answer: v 4 – v 2

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