A body of mass m1 moving with an unknow...

A body of mass `m_1` moving with an unknown velocity of `v_1 hati` undergoes a collinear collision with a body of mass `m_2` moving with a velocity `v_2 hati`. After collision, `m_1 and m_2` move with velocities of `v_3hati and v_4hati` respectively. If `m_2 = 0.5 m_1 and v_3 = 0.5v_1` then `v_1` is:

`v_4 - v_2/4`

`v_4-v_2/2`

`v_4+v_2`

`v_4-v_2`

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