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A man of mass 80 kg runs up a flight of stairs 20 m high in...

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Physics

A manof mass 80 kg runs up a flight of stairs 20 m high in 10 s. (a) howmuch power is used to lift the man? (b) If the man’s body is 25%efficient, how much power does he expend? (c) This man consumesapproximately 1.05 × 107 J (2500 food calories) of energy per daywhile maintaining a constant weight. What is the average power heproduces over a day? (d) Compare this with his power productionwhen he runs up the stairs.

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