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Particle A of mass `m_1` moving with velocity `(sqrt3hati+hatj)ms^(-1)` collides with another particle B of mass `m_2` which is at rest initially. Let `vec(V_1) and vec(V_2)` be the velocities of particles A and B after collision respectively. If `m_1 = 2m_2` and after collision `vec(V_1) - (hati + sqrt3hatj)ms^(-1)`, the angle between `vec (V_1) and vec (V_2)` is :

A

`15^@`

B

`60^@`

C

`-45^@`

D

`105^@`

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