A boy weighing 40kgf climbs up a stair of 30 steps each 20 cm high in 4 minute and a girl weighing 30kgf does the same in 3 minutes. Compare: (i) The work done by them. (ii) The power developed by them
Work done by a boyWork done by girl=m1gh1m2gh2=m1m2=4030=4:3
(ii) Comparing power developed by them:
Power developed by boyPower developed by girl=Work done by boy / time taken to climb up the stairs in secondsWork done by girl / time taken to climb up the stairs in seconds