Question

Madhav lifts a box of mass 1kg to a height of 1m in 1second after lowering the boxhe then lifts it to a height of 2m in 2second has he generated more power in doing the second task give reason to justify your answer

Answer 1

power is define as change in energy in given time..

in first case u lift 1 kg to the high of 1m so U=mgh=1*10*1=10

P=U/t=10/1=10

now in second case u lift 2kg to the high of 2m so U'=mgh=1*10*2=20

P'=U'/t'=20/2=10

hence P=P'

it means u general same power in both case....

Thanks.....