A 1.40 102 kg piano is being lifted at a steady speed from ground level straight up to an apartment 12.0 m above the groundThe crane that is doing the lifting produces a steady power of 4.00 102 WHow much time does it take to lift the piano?
Pw/t wfd Pfd/t tfd/P t1.40102kg9.8m/s/s12m/4.00102W Solve it.
