The force F of attraction between two bodies varies jointly as the weights of the two bodies and inversely as the square of the distance d between them. Express this fact as a variation using c as a constant. Use M1 and M2 for the weights of the two bodies.
Since we are to express the given conditions as a joint variation, we employ the use of k as our constant proportionality which we will denote in this item as k. From the sentence, F = kM₁M₂/d² as we can see those in the denominator as those that vary inversely to the given parameter.
