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An escalator in a department store is driven by a large electric motor whose power consumption changes with the load to keep the escalator moving at a constance velocity, up to a certain maximum power capacity. An escalator working at 0.22 of its maximum power capacity lifts 18 people per minute a vertical height of 6.8m. These people have an average mass of 73kg.

A. How much work is done in 80 s?
B. What is the power delivered by the escalator in watts?
C. What is the maximum mass of people can the escalator deliver in 80 s while working at its maximum power capacity?

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