Electric Potential and Kinetic Energy

[jakey]

Homework Statement

Two identical +9.5e-6C point charges are initially 3.5 cm from each other. If they are released at the same instant from rest, how fast will each be moving when they are very far from each other? Assume they have identical masses of 1.0mg.

Homework Equations

im not sure with this though but i used D(KE) + D(PE) = 0 where D=delta

The Attempt at a Solution

i used the above equation to solve for v. i kinda considered the problem by taking 1 point charge. however, i can't get the right answer...

 

[Doc Al]

i kinda considered the problem by taking 1 point charge.

What do you mean by that?

There are two point charges. Make sure you consider the total change in KE of both of them.