2.4 Exercise 30

If the velocity vector of a polar bear is $\overset{\rightarrow}{u} = \left(−18.0 \hat{i} - 13.0 \hat{j}\right) \text{km} / \text{h}$, how fast and in what geographic direction is it heading? Here, $\hat{i}$ and $\hat{j}$ are directions to geographic east and north, respectively.