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Question:

An 8-hp crane lifts a 100 kg junk metal over a period of 15 seconds. To what distance was the load lifted?

please help me solve.. i really don't get itttt

Answer:

1 horse power = 746 watt. So the work W done by the crane in 15 s is given by W = 8*746*15 J . So the distance, S through which the crane lifted 100 kg, presumably at constant speed is given by 100*9.81*S = 8*746*15 or S = [(8*746*15)/(100*9.81)] = 91.25 m

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