A man lifts 10 bricks to the top of a building by going up a vertical spiral staircase in 5 minutes, whereas a boy lifts 10 bricks to the top of building by going up a slanting ladder in 10 minutes.
Ans. 1. The man does more Work. this is because,acc. to the eqn. W=F.dS
W=dP/dt. dS , from this W is inversely proptnl. to time.Here, the man takes less time than the boy. So, he does 'MORE WORK'...