A car of mass `2000kg` is lifted up a distance of `30m` by a crane in 1 minute . A second crane does the same job in 2 minues. Do the cranes consume the same or different amounts of fuel ? What is the power supplied by each crane ? Neglect power disspation against friction.

Explanation

They consume the same fuel, because work done is the same.
`P_(1)=(mgh)/(t_(1))=(2000xx9.8xx30)/(60)=9800W`
`P_(2)=(mgh)/(t_(2))=(2000xx9.8xx30)/(120)=4900W`