If 720 J of work is performed to move a positive charge of 3.15x10^-4 C closer to another positive charge, what potential difference exists between the start and end points? Also, did the electron gain or lose energy during this process?

I solved the problem:

V=720/3.15x10^-4=7200000/3.15=2285714.285714286=2.29x10⁶ V

but I do not know how to answer the question: did the electron gain or lose energy during this process?

Can someone explain it to me?

Thank you.