$(1)$ What is the average velocity in mph of a storm in a suburban terrain at a height of

$50$ m if its velocity in an open terrain is $100$ mph at $10$ m $?$ What is your answer in knots?

$(2)$ Repeat the problem if the given velocity in an open terrain is $100$ mph at $20m.$

$\frac{?}{\text{b}\text{a}\text{r}}(V)(z)\frac{?}{b}=ar(V)(z_{\text{o}\text{p}\text{e}\text{n}})(\frac{z_0}{z_{0\text{o}\text{p}\text{e}\text{n}}}{)}^{0\mathrm{.}07}\frac{ln(\frac{Z}{z_0})}{ln(\frac{z_{\text{o}\text{p}\text{e}\text{n}}}{z_{0\text{o}\text{p}\text{e}\text{n}}})}$