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Two spherical balls of masses `m_1` and `m_2` collide as shown in figure. After collision mass `m_1` moves with velocity u/3 in a direction perpendicular to original direction. The angle `theta` at which mass `m_2` will move after collision is

A

`tan^-1(frac{1}{2})`

B

`tan^-1(frac{1}{3})`

C

`tan^-1(frac{2}{3})`

D

`tan^-1(3)

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