A 300 kg piano is being lifted at a steady speed from ground level straight up to an apartment 10.0m above the groundThe crane that is doing the lifting produces a steady power of 400WHow much time does it take to lift the piano?
work done F x d F 300 x 9.8 2940 N distance 10 m work done 2940 x 10 29400 J 1 W 1 J/s 29400/400 t 73.5 secs
