Question:
Two bodies of the same mass are moving with the same speed, but in different directions in a plane. They have a completely inelastic collision and move together thereafter with a final speed which is half of their initial speed. The angle between the initial velocities of the two bodies (in degree) is______
Solution:
Momentum conservation along $x$ direction,
$2 m v_{0} \cos \theta=2 m \frac{v_{0}}{2} \Rightarrow \cos \theta=\frac{1}{2}$ or $\theta=60^{\circ}$
Hence angle between the initial velocities of the two bodies
$=\theta+\theta=60^{\circ}+60^{\circ}=120^{\circ}$
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