A block P of mass 2kg slides without friction along a straight horizontal track with speed 8m s−1 and collides with a stationary block Q of mass 4kg.
After the collision, block P is observed to rebound along the original line of motion with speed 2m s−1.
(i) Find the coefficient of restitution for the collision.
(ii) Calculate the speed of block Q immediately after the collision and state its direction of motion.
(iii) Compute the percentage loss of the total kinetic energy of the two-block system due to the collision.