Benson A.

asked • 11/13/23

Q7 - This problem has two parts. I will list the questions for both parts and any additional info in the "Description" below.

Suppose a 77.5 kg sprinter accelerates from rest to 8.5 m/s in 3.15 s.


Part a) What is the power output, in watts, of the sprinter?


Part b) What is the power output, in horsepower, of the sprinter?

1 Expert Answer

By:

Peter M. answered • 11/14/23

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AP Physics 1 & 2, IB Physics. Engineer with 30 years teaching Physics
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Power = Work / ΔTime

Work = ΔKE = 1/2 m (Δv)2


746 Watts = 1 Horsey

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Benson A.

Thank you for providing your input, much appreciated.
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11/23/23

Benson A.

In regard to part a, based on your provided formulas an information given by problem, I got a power value of about 888.79 W. Therefore I got P = 888.79 W, as my answer to part a. Is this correct?
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11/23/23

Benson A.

In regard to part b, based on your provided conversion and using the power value obtained from part a, I got a power value of 1.19 horsepower. Therefore, I got P = 1.19 horsepower, as my answer to part b. Is this correct?
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11/23/23

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