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1 January, 23:20

At what minimum rate is a 60.0-kg boy using energy when, in 8.00 s, he runs up a flight of stairs that is 10.0-m high?

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  1. 1 January, 23:59
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    The answer is 735 W.

    He runs up the stairs, so he needs a total amount of energy = mgh = 5880 Joules. For the rate: since he goes from zero energy to 5880 Joules over 8 seconds ... Joules/sec = 5,880/8 = 735 W
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