I'm studying relation between conservative force and potential energy,and getting a big question on change in potential energy is always negative. For gravitational PE ,when an object is lifting up, it's work done is negative(opposite direction). so the change in work done is negative. On the other hand, when an object is falling down, it's work done is positive(same direction). And the change in work done is also positive. Why??? Am i wrong in change in work done(final-initial)? Thanks in advance.