Two point charges connected by a massless rope

Question:

Two positive charges q(a) and q(b) and masses m(a) and m(b) are at rest, held together by a massless string of length d. Now the string is cut, and the particles fly off in opposite directions. How fast are each going when they are far apart.

My attempt:

From this the first thing I done was make a formulae for the forces and apart from that my only ideas where to use the fact that when they are far apart the not energy which would need to be considered would be that of kinetic and the conservation of momentum would hold for this problem??

Any more ideas or how to develop my own is what I’m really looking for here, thanks a lot

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