A 220-kg object is lifted at a constant speed through a height of 42 m by a crane. If the crane takes a total time of 1.8 seconds to lift this object, what is the average power required? Use g = 10 m/s2.
A) 25 kW
B) 51 kW
C) 75 kW
D) 100 kW
E) 150 kW
Correct Answer:
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