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## Homework Statement

The problem states that two protons are aimed at each other with a certain velocity v. It asks what is the maximum electrical force they will exert on each other.

The velocity is given at 1000km/s. And that is everything given.

## Homework Equations

KE = 1/2mv^2

F = q*q/(4*pi*e*r^2)

## The Attempt at a Solution

I am stuck on the approach. I have managed to find the kinetic energy of the protons but that is it. I don't know where to go from here . I think I should use Coulomb's Law, but I need to find the radius for that. Any suggestions?