Kinetic energy:

$\overline{)\begin{array}{rcl}\mathbf{K}\mathbf{.}\mathbf{E}& {\mathbf{=}}& \frac{\mathbf{1}}{\mathbf{2}}{\mathbf{mv}}^{\mathbf{2}}\end{array}}$

1 eV = 1.6 × 10^{-19}J

A proton with an initial speed of 600,000 m/s is brought to rest by an electric field.

What was the initial kinetic energy of the proton, in electron volts?

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