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A particle of mass m1 = m moving with velocity 10$$\sqrt3$$m/s ˆ i collides with a particle of mass m2 = 2m at rest. After collision m1 comes to rest and m2 breaks into two equal parts such that one part has velocity 10 m/s ˆ j then find the angle the velocity vector of other part makes with x-axis in degrees.

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$$\vec p_f=\vec p_i$$
M × 10 $$\hat j$$ + m$$\vec v$$= m × 10 $$\sqrt 3\hat i$$
$$\vec v=10\sqrt3 \hat i+10\hat j$$