[SOLVED] Need Help on Gravitation Potential Energy Problem 1. The problem statement, all variables and given/known data (a) A 5.3 kg particle and a 3.0 kg particle have a gravitational attraction with a magnitude of 2.6 x10^-12 N. What is the gravitational potential energy of the two-particle system? (b) If you triple the separation between the particles, how much work is done by the gravitational force between the particles? (c) How much work is done by you? 2. Relevant equations F=(GmM)/r^2 U=-(GmM)/r 3. The attempt at a solution First I used the given information to solve for r using newtons law of gravitation. Then I pluged r=1.96E1 into the potential energy equation to get -5.41E-11J but that was wrong.