One man takes 1 minute to raise a box to a height of 1 m and another man takes ½ minute to do so. The energy of the two is

Solution: Energy to lift a weight is calculated as:

E = mgh

Here height, h is same for a box so energy will be same.

However, power is different as it is defined as the rate of energy to do work. Since the second man takes a shorter time for the same amount of work, he has greater power and does work faster.