How Does Electric Potential Affect Proton Movement?

[CheetoFang]

Homework Statement

Suppose that a metal plate is held at an electric potential of 1.8 Volts. A proton is placed on the plate where it is repelled by the plate. What is the electric potential energy of the proton measured in Joules? __ x 10-19 Joules
After the proton has moved away from the plate, and all the electric potential energy is gone, how fast will the proton be moving? __meters/second

Homework Equations

The Attempt at a Solution

 

[Ampere]

Do you know a relationship between potential energy and voltage? (Think of voltage as potential energy per unit charge.)