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The wind is blowing at $18 \ miles \ per \ hour$ in the direction $\text{S}60°\text{E}$.

Express its velocity as a vector $\mathbf{v}$ in terms of $\mathbf{i}$ and $\mathbf{j}$

A

$9\mathbf{i}-9\sqrt{3}\mathbf{j}$

B

$-9\sqrt{3}\mathbf{i}+9\mathbf{j}$

C

$9\mathbf{i}+9\mathbf{j}$

D

$-9\sqrt{3}\mathbf{i}-9\sqrt{3}\mathbf{j}$

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