Derive final velocities `V_1 and V_2` after perfectly elastic collision.

For perfectly elastic collision

For perfectly elastic collision

What is perfectly elastic collision ?

Derive expression for final velocities v_1 and v_2 for an Elastic collsion.

Find the increment of the kinetic energy of the closed system comprising two spheres of masses m_1 and m_2 due to their perfectly inelastic collision, if the initial velocities of the sphere were equal to v_1 and v_2 .

A ball falls vertically on an inclined plane of inclination alpha with speed v_0 and makes a perfectly elastic collision. What is angle of velocity vector with horizontal after collision.

A ball falls vertically on an inclined plane of inclination alpha with speed v_0 and makes a perfectly elastic collision. What is angle of velocity vector with horizontal after collision.