11. What is the gravitational potential energy of a 35 kg child standing on a diving board that is 12 meters above the water? 12. A 1.24 kg case of snacks was dropped from a 4.25 m balcony to the cafeteria below. What is the kinetic energy of the case of snacks just before it hits the ground? Momentum Review 13. A 105 kg guy runs at 3.25 m/s down the parking lot to catch a cart before it hits his car. The cart seems to gain speed as it rolls in the lot causing the guy to change his velocity to 4.5 m/s over a period of 0.77 seconds. What force did the guy use as he changed his velocity? 14, A 22.7 kg child learning to ride a bicycle has a velocity of 2.75 m/s. How long would it take to stop if a breaking force of 12.5 N acts on the child? 15. Which of the following has the greatest momentum? a) the 5000 kg moving truck moving at 0.05 m/s b) a 1435 kg car meving at 1.3 m/s ) a 2,000,000 kg train at the depot going 0 m/s d) the 865 kg missile flying at 5.4 m/s 16. What is the momentum of a 0.625 kg basketball headed for the hoop at 2.49 m/s 17. A 1.25 kg golf ball hits a 3.10 kg bottle standing up on the counter. If the ball was moving forwards at 4.75 m/s before running into the bottle, and the bottle went flying forward at 1.15 m/s after it was hit, what is the forward velocity of the ball after it collided with the bottle