How is f is directly proportional to 1\r^2 derived

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It is not derived. It is found using experiment. So this finding is written as proportional. Also they found masses of bodies also directly proportional. And finally write the equation f= GMm/r^2.
here G is constant of proportion. And it's value also found experimentally.

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How is f is directly proportional to 1\r^2 derived

It is not derived. It is found using experiment. So this finding is written as proportional. Also they found masses of bodies also directly proportional. And finally write the equation f= GMm/r^2. here G is constant of proportion. And it's value also found experimentally.

It is not derived. It is found using experiment. So this finding is written as proportional. Also they found masses of bodies also directly proportional. And finally write the equation f= GMm/r^2.
here G is constant of proportion. And it's value also found experimentally.