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$\begingroup$ “No need for any calculus”, well, the way that I learned this in (my country’s equivalent of) high school, the $\frac{GMm}r$ was obtained by integrating $\frac{GMm}{r^2}$, so there was some calculus in it. $\endgroup$
– Carsten S
Commented Nov 12, 2023 at 14:53

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