Question

A body of mass m makes an elastic collision with another identical body at rest. Show that if the collision is not head-on, the bodies go at right angle to each other after the collision.

Answer 1

Since it is not an head on collision, the two bodies move in different dimensions. Let V₁, V₂ →velocities of the bodies vector collision. Since, the collision is elastic. Applying law of conservation of momentum on X-direction.