# physics

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A 301 kilogram piano is being lifted at a steady speed from ground level straight upward to an apartment 10.0 meters above the ground. The crane that is doing the lifting produces a steady power of 415 watts. How long does it take to lift the piano?

I don't understand how to begin to solve the question.

• physics -

power = work/time (W)
work = force * distance (J)
force = mass * g (N)

work = 301*9.8*10 = 29498J
power = 415J/sec

time = work/power = 71.08 s

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