A 5.2 kg particle and a 2.4 kg particle have a gravitational attraction of magnitude 2.3E-12 N. Gravitational potential energy is -4.40e-11J and r=19.03m If you were to triple the distance between these particles, how much work is done by you on the particles? My biggest problem here is that I don't know what equation I should use to find the work done. My book doesn't explain it very well. The first part of the question I figured out fine but this is where I'm stuck. Any help would be greatly appreciated.