Question

How much work does it take to raise a `78 kg` weight `5 m`?

Answer 1

`3800"J"`

Explanation:

First we will note that in this case the work done raising the weight will be converted entirely into gravitational potential energy.

The gravitational potential energy of the weight when it has been raised `5 "m"` is equal to `mgh` which in this case is equal to

`3825.9 "J"`

Considering that we should have two significant digits, our final answer will be

`3800 "J"`