An object of mass m is moved straight up by a distance h. The work that gravity does on the object is:
(e) None of the Above
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?