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**[SOLVED] Need Help on Gravitation Potential Energy Problem**

## Homework Statement

(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?

## Homework Equations

F=(GmM)/r^2

U=-(GmM)/r

## 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.