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The winning time for the 2005 annual race up 86 floors of the Empire State Building was 10 min and 49 s. The winner's mass

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The winning time for the 2005 annual race up 86 floors of the Empire State Building was 10 min and 49 s. The winner's mass was 60 kg. If each floor was 3.7 m high and the efficiency in climbing stairs is 25 %, what total energy did the winner expend during the race? ( 748 J 74800 J 748000 J 7480 J

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