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Muscles operate with an efficiency of about 18 % in converting energy internally into work externally. Accordingly, how much energy (in Joules) will be expanded

Muscles operate with an efficiency of about 18 % in converting energy internally into work externally. Accordingly, how much energy (in Joules) will be expanded by a 71.6 kg person in the process of ascending several flights of stairs to a height of 21.6 m?

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