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A given particle starts at $x = 1$ on the potential function $U(x) = x^{2} - 10 x + 25$, where $U$ is in Joules and $x$ is in meters.

It then moves down the potential gradient to $x = 3$ where it has $4 J$ of potential energy.

If it started at rest, how much kinetic energy does it have as it passes through $x = 3$?

A

$2 J$

B

$4 J$

C

$8 J$

D

$12 J$

E

$16 J$

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