AP Physics 1mediummcq1 pt
A 60 kg person runs up a flight of stairs that is 4.0 m high in 6.0 s. What is the average power output of the person?
A.B) 240 W
B.D) 40 W
C.C) 98 W
D.A) 392 W
Explanation
Core Concept
Power is the rate at which work is done, or P = W/t. The work done is equal to the change in gravitational potential energy, W = mgh = 60 × 9.8 × 4.0 = 2352 J. Then P = 2352 J / 6.0 s = 392 W. Option B is incorrect because it uses m/t instead of mgh/t. Option C is incorrect because it uses gh/t instead of mgh/t. Option D is incorrect because it uses m/t instead of mgh/t.
Correct Answer
DA) 392 W
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