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52. A 100 kg man walks to the top of the building 20 m high in 90 s. What is the gain in potential energy of the man on the top of the building? (b) How much work did the do against gravity? (c) What is the power generated by the man in watts and in horsepower? [2.0 x 10 J; 2.0 x 10 J; 222 watts; 0.298 hp ]

52. A 100 kg man walks to the top of the building 20 m high in 90 s. What is the gain in potential energy of the man on the top of the building? (b) How much work did the do against gravity? (c) What is the power generated by the man in watts and in horsepower? [2.0 x 10 J; 2.0 x 10 J; 222 watts; 0.298 hp ]

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52. A 100 kg man walks to the top of the building 20 m high in 90 s. What is the gain in potential energy of the man on the top of the building? (b) How much work did the do against gravity? (c) What is the power generated by the man in watts and in horsepower? [ 2.0 x 10 J; 2.0 x 10 J; 222 watts; 0.298 hp ] 53. A 4 kg object is moving with a kinetic energy of 200 J. (a) What is the speed of the object? (b) What is the magnitude of the momentum of the object? [ 10 m/s; 10 kg.m/s] 54. A 0.80 kg ball falls 2.5 m. How much work does the force of gravity do on the ball? [4.4 J] 55. An electric motor develops 65 KW of power as it lifts a loaded elevator 17.5 m in 35 s. How much force does the motor exert? [1.3 x 10° N]
Transcribed Image Text:52. A 100 kg man walks to the top of the building 20 m high in 90 s. What is the gain in potential energy of the man on the top of the building? (b) How much work did the do against gravity? (c) What is the power generated by the man in watts and in horsepower? [ 2.0 x 10 J; 2.0 x 10 J; 222 watts; 0.298 hp ] 53. A 4 kg object is moving with a kinetic energy of 200 J. (a) What is the speed of the object? (b) What is the magnitude of the momentum of the object? [ 10 m/s; 10 kg.m/s] 54. A 0.80 kg ball falls 2.5 m. How much work does the force of gravity do on the ball? [4.4 J] 55. An electric motor develops 65 KW of power as it lifts a loaded elevator 17.5 m in 35 s. How much force does the motor exert? [1.3 x 10° N]
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