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?

Question

Physics

Gerald Robinson

3 August, 16:12

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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Answers (1)

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Libby Estrada · Answer 1

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