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    				| 1. | 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 rach deos?Take density of water =10^(3) kg m^(-3) and g=9.8 N kg^(-1) | 
| Answer» Solution :(a) (i)WORK 1:1 , (II)POWER 2:3 , (b)Work done by each =3.92 kJ | |