Question

Two objects have masses of `16 MG` and `22 MG`. How much does the gravitational potential energy between the objects change if the distance between them changes from `5 m` to `39 m`?

Answer 1

The gravitational potential energy is `(Gm_1m_2)/r`, where `G` is Newton's gravitational constant, `m_(1,2)` are the two masses and `r` is the distance between them.

Explanation:

Taking `G=6.674×10^(−11)` N·(m/kg)`\ ^2`, the masses should be written in kg (I'm not sure what 16MG and 22MG actually mean) and the distance `r` should be in metres (as you have).
Then just put the numbers into the formula to calculate the two potential energies and take the difference,