- #1

- 37

- 0

## Homework Statement

An object of mass m is moved straight up by a distance h. The work that gravity does on the object is:

(a) -mh

(b) +mh

(c) -mgh

(d) +mgh

(e) None of the Above

## Homework Equations

Work = ∫F dl

PE = mgh

## The Attempt at a Solution

I have a feeling the answer is (c) -mgh because work is done to lift the object. The object is gaining potential energy so it's gaining +mgh and due to Newton's 3rd law, the work done by gravity is -mgh. Is that right?