Question

A coach has set the machine in Problem 49 to launch balls horizontally with a speed of 52.0 m/s at a rate of one ball every 1.50 s. He forgot to set the brake on the machine. If the coefficient of rolling friction between the machine and the court is 0.00300 and all 200 balls are launched out, what is the maximum speed of the machine? (Compare your result with that of Problem 49.)

Problem 49

A tennis ball machine holds 200 balls and has a mass of 38.5 kg when empty. Each tennis ball has a mass of 56.7 g. A coach has set the machine to launch balls horizontally with a speed of 52.0 m/s. He forgot to set the brakes on the machine. If rolling friction between the machine and the court is negligible and all 200 balls are launched, what is the final speed of the machine?

Answer 1