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Question :
56. A baseball catcher puts an exhibition by catching a : 2102110

56. A baseball catcher puts on an exhibition by catching a 0.150-kg ball dropped from a helicopter at a height of 100 m above the catcher. If the catcher "gives" with the ball for a distance of 0.750 m while catching it, what average force is exerted on the mitt by the ball? (*g* = 9.80 m/s^{2})

A. 78 N

B. 119 N

C. 197 N

D. 392 N

57. A girl and her bicycle have a total mass of 40.0 kg. At the top of the hill her speed is 5.0 m/s, and her speed doubles as she rides down the hill. The hill is 10.0 m high and 100 m long. How much kinetic energy and potential energy is lost to friction?

A. 2 420 J

B. 1 500 J

C. 2 000 J

D. 3 920 J

58. A girl and her bicycle have a total mass of 40 kg. At the top of the hill her speed is 5.0 m/s. The hill is 10 m high and 100 m long. If the force of friction as she rides down the hill is 20 N, what is her speed at the bottom?

A. 5.0 m/s

B. 10 m/s

C. 11 m/s

D. She stops before she reaches the bottom.

59. I drop a 60-g golf ball from 2.0 m high. It rebounds to 1.5 m. How much energy is lost?

A. 0.29 J

B. 0.50 J

C. 0.88 J

D. 1.0 J

60. A parachutist of mass 50.0 kg jumps out of an airplane at a height of 1 000 m. The parachute deploys, and she lands on the ground with a speed of 5.0 m/s. How much energy was lost to air friction during this jump?

A. 49 400 J

B. 98 700 J

C. 198 000 J

D. 489 000 J