# Hurling protons at one another to find where they stop

1. Oct 1, 2009

### HellaciousD

Two protons that are very far apart are hurled straight at each other, each with an initial kinetic energy of 0.19 MeV, where 1 mega electron volt is equal to (1*10^6)*(1.6*10^-19) joules. What is the separation of the protons from each other when they momentarily come to a stop?
separation = 1 m

Maybe I'm just missing the necessary formula. Is there a way to incorporate Electric Potential Energy formula and the energy principle here?

Last edited: Oct 1, 2009
2. Oct 1, 2009

### willem2

Certainly. The protons will stop when all their kinetic energy is converted to electric potential energy.
Both of the protons have kinetic energy at the start. The potential energy $$\frac {k q_1 q_2} {r}$$ is shared by both protons.