Particle Motion and Change of Direction

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A particle moves along the $x$ -axis with velocity given by $v(t) = t^3 - 7t^2 + 14t - 8$ for $0 \leq t \leq 5$ . How many times does the particle change direction on this interval?

$\displaystyle 4$

$\displaystyle 3$

$\displaystyle 1$

$\displaystyle 2$

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