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OpenStudy (anonymous):

Why do we need to be careful with the signs when we calculate the change in gravitational potential energy in the y direction?

OpenStudy (anonymous):

sings ?

OpenStudy (anonymous):

Well, it all boils down to how you define your potential energy... since \[dEp=- \delta W =- \vec{F} \cdot d\vec{L} \] The way your dL is defined, that is the direction of your axis, is going to change the expression of potential energy...

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