Example: Two Point Charges

Suppose two electrons are held in place $10\mathrm{.}0$ cm apart. Point a is midway between the two electrons, and point b is $12\mathrm{.}0$ cm directly above point a$.$

$($a$)$ Calculate the electric potential at point $$a$$ and at point $$b$.$

$($b$)$ A third electron is released from rest at point $$b$.$ What is the velocity of this electron when it is very very far from the other two electrons at position $$c$?=9\mathrm{.}111031$