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Question

Why? G=gm1m2r2

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Solution

That's because it's derived from the universal law of gravitation, which is as follows:
Newton's law of universal gravitation states that any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Fgravity=GMmd2G=6.67×1011Nm2kg2

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