In a one-dimensional elastic collision a ball of mass 0.52 kg, moving with velocity 5.2 m/s, strikes an initially stationary ball of mass 0.81 kg….

In a one-dimensional elastic collision a ball of mass 0.52 kg, moving with velocity 5.2 m/s, strikes an initially stationary ball of mass 0.81 kg. Find the final velocity of the initially moving ball.