Question

How much work does it take to raise a `7 kg` weight `9 m`?

Answer 1

`617.4J`

Explanation:

Assuming it is raised vertically on or near earth, the work done is equal to the potential energy gained.

`W=E_p=mgh`

`=7kgxx9.8m//s^2xx9m`

`=617.4J`