Chapter 12.3, Problem 2QCE

If r(s) is a smooth vector-valued function parametrized by arc length s, then $‖\frac{d\text{r}}{ds}‖=\text{\_\_\_\_\_\_\_\_\_}$ and the arc length of the graph of r over the interval $a\le s\le b\text{is\_\_\_\_\_\_\_}\text{.}$