1. The problem statement, all variables and given/known data There are two roads of length x.There separation is also x.They have mass k and p.Than what is the force exerted by one on the other. 2. Relevant equations I think f=gmM/R^2 IS THE EQUATION TO BE USED. 3. The attempt at a solution When I solved (dx)^2 was coming during integration which is not solvable for me.