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The position of a particle varies with time according to the equation:

$$x(t) = t^3– 12t+5$$

What is the acceleration of the particle when it changes direction?

$2\text{ m/s}^2$

$4\text{ m/s}^2$

$6\text{ m/s}^2$

$10\text{ m/s}^2$

$12\text{ m/s}^2$