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## Homework Statement

There were two parts to this problem

a) if you do 12 J of work to push 0.001 C of charge from point A to point B in an electric field, what is the voltage difference between A and B?

I already solved this part, I got [tex]\Delta[/tex]V=12,000 V

b) When the charge is released, what will be its kinetic energy as it flies back past its starting point A? What principle guides your answer?

Here i have absolutely no idea what to do.

## Homework Equations

[tex]\Delta[/tex]V=W/q

[tex]\Delta[/tex]V=[tex]\Delta[/tex]PE

_{electric}/q

## The Attempt at a Solution

I've gotten through part A but i have no idea how to approach part B.