Answer
Yes the speed (and velocity) will be zero at $t=2 s$
Work Step by Step
Lets write our equation again: $v=\frac{dx}{dy}=6t-12 $ If $v=0$, then $0=6t-12$ $12=6t$. $6t=12$ Solving, we find that $t=2$. This means that the velocity will be zero at $t=2 s$.
