1. The problem statement, all variables and given/known data So I want to know the distance to 2. The proton is at v=0 at the 1. We know that: q=1.602*10^-19 point 1 L=1mm v=1.1*10^6 at point 2 F=1.44*10^-12 at point 1 2. Relevant equations E=(1/4πε)*(q/r2) ΔV=∫E*dr=(1/4πε)*q∫(1/r2)=(1/4πε)*q*(1/r2-1/r1) ΔU=ΔK=mv2/2 ΔK=mv2/2=ΔV*q=q*(1/4πε)*q*(1/r2-1/r1) 3) The attempt at a solution I can't seem to calculate the distance. I don't know where I've gone wrong.