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## Main Question or Discussion Point

Is there a mathematical derivation for:

[tex]g=\frac{GM}{r^{2}}[/tex]

...or is that just observed?

Also, if someone knows how to show this, could you post it here or at least a hint?

[tex]g=\frac{GM}{r^{2}}[/tex]

...or is that just observed?

Also, if someone knows how to show this, could you post it here or at least a hint?