Question

Two charged particles q1 and q2 were initially at rest at a seperation of 2m in a gravity free space. Then evaluate after what time seperation between them will be 8m (neglect electromagnetic losses) .

Answer 1

You can compute the potential energy change (a decrease) using the Coulomb force, and this will equal the total kinetic energy increase. To get the time required for specific separation, you need to know the masses of each particle.