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why at uniform gravitational field PE = -GMm/r^2 becomes PE=mgh.... I have confusion where to use which formula,,,can u pls clarify that?

why at uniform gravitational field PE = -GMm/r^2  becomes PE=mgh.... I have confusion where to use which formula,,,can u pls clarify that?

Grade:12th pass

2 Answers

Saurabh Kumar
askIITians Faculty 2400 Points
8 years ago
First formula is associated with gravitational potential energy between two objects.
While second formula is associated with gravitational potential energy agains earyh’s gravitational field.
buddha
28 Points
8 years ago
than q for ur response sir.. but my ndoubt not cleared...
 
why cant I take earth as one object to apply PE = mgh
 can u pls derive mgh from -GMm/R

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