APFIVE Particle Motion and Stationary Points
For $$t \geq 0$$, the velocity of a particle moving along the $$x$$-axis is given by $$v(t) = t^2 - 8t + 15$$. At which value of $$t$$ is the particle stationary?
A
$$\displaystyle t = 3$$ only
B
$$\displaystyle t = 4$$ only
C
$$\displaystyle t = 3$$ and $$t = 5$$
D
$$\displaystyle t = 5$$ only
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