Physics
posted by Delli .
a 300kg piano is being lifted at a steady speed from ground level straight up to an apartment 10.0m above ground. The crane that is doing the lifting produces a steady power of 400 W. How much time does it take to lift the piano?

Time required (s) = (Work required, J)/(Power, W)
The amount of work required is
W= M g *(10 meters) = 300*9.8*10 Joules
Finish the calculation