a. Explain what is meant by an:

i. Elastic collision
ii. Inelastic collision.

b. A snooker ball of mass 0.35 kg hits the side of a snooker table at right angles and bounces off also at right angles. Its speed before collision is 2.8 m s⁻¹ and its speed after is 2.5 m s⁻¹. Calculate the change in the momentum of the ball.

c. Explain whether or not momentum is conserved in the situation described in part b.