Proton is moving at an alpha particle, distance when it stops

[niveda]

Homework Statement

an alpha particle with a charge of 2e is fixed at the origin. a proton is aimed at the alpha particle and shot from a distance of 2.00 m at a speed of 3.46x10^6 m/s. How close will the proton come to the alpha particle before coming to a stop?

Homework Equations

Please help I need to know this for my test!

The Attempt at a Solution

Ek=Ee (maybe ?) [/B]

 

[gneill]

A plea for help is not a relevant equation. Follow through on your suggested solution approach: What equations are relevant here?

 

[niveda]

So is it correct that Ek=Ee?
If that's the case then 1/2mv^2 and kq/r^2 would be relevant

 

[gneill]

So is it correct that Ek=Ee?

The basic idea is correct. You'll have to expand on it though; What conservation rule is involved?

If that's the case then 1/2mv^2 and kq/r^2 would be relevant

Yes.