a man a man weighing 800 and climbs up a flight of stairs to a height of 15 m in 12 seconds what is the man's average power output

  1 kW

Explanation:

We assume the man's weight is measured in newtons. Then the power expended is ...

  (800 N)(15 m)/(12 s) = (12000 N·m)/(12 s) = 1000 N·m/s = 1000 W

The man's average power output is 1 kilowatt.

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explanation:

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