Particle Motion and Stationary Points

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A particle moves along the $x$ -axis with velocity $v(t) = t^2 - 8t + 15$ for time $t \geq 0$ . At what value of $t$ is the particle stationary?

$\displaystyle t = 4$ only

$\displaystyle t = 3$ and $t = 5$

$\displaystyle t = 3$ only

$\displaystyle t = 5$ only

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