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Im a bit confused reguarding gravitational potential energy.

I've seen 2 different calculations

U(h) = mgh

where h is the height above the ground.

and

U = -GMm/r (off the top of my head, havnt got my notes here with me right now)

Could anyone help clear this up for me? Why does one expression have a negative potential?

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# Confusion about Gravitational Potential

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