AP Physics 1mediummcq1 pt
A 1000 kg elevator is lifted a vertical distance of 20 m at a constant speed of 2 m/s. How much power is required to lift the elevator?
A.200 W
B.1000 W
C.20000 W
D.40000 W
Explanation
Core Concept
Power is the rate of doing work, P = W/t. The work done is W = mgh = 1000 kg × 9.8 m/s² × 20 m = 196000 J. The time taken is t = d/v = 20 m/2 m/s = 10 s. Therefore, P = 196000 J/10 s = 19600 W, which is approximately 20000 W.
Correct Answer
C20000 W
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