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91. A crane lifts a 614 kg roof 9.3 m high above the ground at a constant speed. It takes 48.4 seconds to do 50.

91. A crane lifts a 614 kg roof 9.3 m high above the ground at a constant speed. It takes 48.4 seconds to do 50. a) Calculate the work done by the crane. b) Calculate the crane's power

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