(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

At what rate is a 50 kg boy using energy when he runs up a flight of stairs 10 m high, in 7 s? Provide answer in watts. (Hint: Rate of change of energy is power) Use g=10 m/s2.

2. Relevant equations

F=ma

W=Fd

P=W/T

3. The attempt at a solution

10/7 = .143 = A

F = MA, so F = .143*50 = 7.15

W = FD, so W = 7.15 *10

P = W/T, so P = 71.5/7

Is that right? Am I using the correct acceleration and distance and time, or is there more complicated math involved than I thought?

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# Homework Help: Rate of Energy/Watts

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