A nucleus[atomic no Z, mass no. A] splits into two fragments(z1,A1) and (Z2,A2).Find the separation between them at the time of splitting.

I am giving the way I would approach.Please check and confirm:

rest energy of (Z,A)=rest energy of (Z1,A1)+rest energy of (Z2,A2)+Coulomb repulsion term

The Coulomb repulsion term includes the required separation.

Please check if I am correct.