Q. A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes. (a) Compare : (i) the work, and (ii) power developed by them. (b) How much work each does? Take density of water = ${10}^{3}kg m^{-3} and g =9·8 N k{g}^{-1}$