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A set of 20 stairs, each of 20-cm height, is ascended by a 700-N man in a period of 12.5 s. Calculate the mechanical work,

A set of 20 stairs, each of 20-cm height, is ascended by a 700-N man in a period of 12.5 s. Calculate the mechanical work, power, and change in potential energy during the ascent. What happens to power if he does it in 9s?

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