Chrissy1738 Chrissy1738

08-06-2017
Physics

contestada

James weighs 120 pounds. He ran up the steps which rose 12 feet. John weighs 91 pounds. He ran up the same steps as James. If both boys reached the top of the 12-foot stairs at the same time, which boy had the greatest horsepower?

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anonymous79 anonymous79

08-06-2017

Mass of James = 54.431kg
Distance ran by James = 3.6576m
Mass of John= 41.277kg
Distance relan by John= 3.6576m

Work done by James = 54.431kg*10N/kg*3.6576m= 1990.87J

Work done by John= 41.277kg*10N/kg*3.6576m=1509.75J

Horsepower = work done / time since time is same, James has larger horsepower

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