Weegy: That's Newton's Law of Gravitation. Since it varies directly with M1 and M2 and inversely with the square of the distance, we have: F \alpha \frac{M_1 M_2}{d^2} Where alpha means that Force is proportional to that. [ But we need a constant, known as proportionality constant, to make the equation true. So: F = c \frac{M_1 M_2}{d^2}
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