$18\mathrm{.}02$ Two very large charged parallel metal plates are $12\mathrm{.}0cm$ apart and produce a uniform electric field of $2\mathrm{.}60{10}^6\frac{N}{C}$ between them. A proton is fired perpendicular to these plates with an initial speed $5\mathrm{.}20k\frac{m}{s},$ starting at the middle of the negative plate and going toward the positive plate.

Part A

How much work has the electric field done on this proton by the time it reaches the positive plate?

Express your answer with the appropriate units.

$W=$