A blue ball moving with 45 m/s strikes a red stationary ball of identical mass. After the collision the blue ball moves at 20 m/s, at an angle θ = 60° with respect to the original line of motion.
(a) Find the velocity of the red ball after the collision, and find the angle Φ
(b) Is the collision elastic or inelastic? -you must show a calculation to get marks for this question.
(c) Does it make sense to have more total kinetic energy after the collision than before collision?