The position of a body moving along the $s$-axis is given by $s = t^{3}-6t^{2}+9t$, with $s$ in meters and $t$ in seconds.

(a) Find the body's acceleration each time the velocity is zero. If there is more than one answer, enter a comma separated list. If there are no answers, enter NONE.
Acceleration = $\mathrm{m/s^2}$

(b) Find the body's velocity each time the acceleration is zero. If there is more than one answer, enter a comma separated list. If there are no answers, enter NONE.
Velocity = $\mathrm{m/s}$

(c) Find the total distance traveled by the body from $t = 0$ to $t = 2$.
Total distance = $\mathrm{m}$