A particle moves along the $x$-axis so that its velocity at time $t \ge 0$ is given by $v(t) = t^2 - 5t + 6$. At time $t = 1.5$, is the speed of the particle increasing or decreasing, and why?

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A particle moves along the $x$-axis so that its velocity at time $t \ge 0$ is given by $v(t) = t^2 - 5t + 6$. At time $t = 1.5$, is the speed of the particle increasing or decreasing, and why?

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