Question

nt: what is the unit of measurement for work?)A body builder lifts a 200kg barbell up 2m into the air. Howmuch work does the bodybuilder do?

Answer 1

The unit of work is Joules.

The potential energy and the work are related by:

`\Delta U=-W`

Then we have:

`\begin{gathered} (200)(9.8)(2)-(200)(9.8)(0)=-W \\ W=-3920 \end{gathered}`

This means that the gravitational force if doing a work of -3920 over the rock; this also means that the bodybuilder is making 392making 392