In a game of cricket, a fast bowler releases the ball at 140 kmhr−1 . The ball has a mass of 160 g . Slow-motion cameras show that the ball loses about 15% of its kinetic energy during the 15 m distance from the bowler to the batsman.
a. Determine the speed of the ball at its release in ms−1 .
b. Calculate how much work is done on the ball by the friction of the air.
c. Calculate the average force of air friction acting on the ball.