Solve the Problem $m / s e c)$ Of a Particle Moving on The

Multiple Choice

Solve the problem.
-Suppose that the speed (in $m / s e c)$ of a particle moving on the $x$ -axis at time $t$ seconds ( $t \geq 0$ ) is given by:
$$V(t) =t^{3}-8 t^{2}+15 t+10$$
Find V(4) .

A) $6 \mathrm{~m} / \mathrm{sec}$
B) $11 \mathrm{~m} / \mathrm{sec}$
C) $21 \mathrm{~m} / \mathrm{sec}$
D) $16 \mathrm{~m} / \mathrm{sec}$