A5 kg sledge hammer is held over head (2 meters above the ground). what is the maximum amount of work it can do if it falls to the ground?

The maximum amount of work that the hammer can do while falling to the ground is equal to its variation of gravitational potential energy, which is given by:

where m is the mass of the hammer, g is the gravitational acceleration, h is the variation in altitude of the hammer.

Plugging the data of the problem inside the equation, we find

What is the things about?

Ithink the answer is a