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OpenStudy (anonymous):
An escalator is 60m long and lifts passengers through a vertical height of 30m. To drive the escalator against the forces of friction when there are no passengers requires a power of 2.0kW. The escalator is used by passengers of average mass 60kg and the power to overcome friction remains constant. How much power is required to drive the escalator when it is carrying 20 passengers and is travelling at 0.75ms–1? A 4.4kW B 6.4kW C 8.8kW D 10.8kW
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