Kinetic Energy:

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

Electric potential energy:

$\overline{){\mathbf{U}}{\mathbf{=}}{\mathbf{q}}{\mathbf{V}}}$

**(a)**

Electrons move in a direction opposite the electric field. The electric field points in the direction of decreasing potential.

An electron with an initial speed of 5.50×10^{5} is brought to rest by an electric field.

(a) Did the electron move into a region of higher potential or lower potential?

(b) What was the potential difference that stopped the electron? In V

(c) What was the initial kinetic energy of the electron, in electron volts? In eV

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