Which of the following is a unit vector in the direction
Chapter 6, Problem 6.1.1.70(choose chapter or problem)
Which of the following is a unit vector in the direction of \(\mathbf{v}=-\mathbf{i}+3 \mathbf{j}\)
\begin{array}{l}\text{(A) } -\frac{1}{10} \mathbf{i}+\frac{3}{10} \mathbf{j}\\\text{(B) } \frac{1}{10} \mathbf{i}-\frac{3}{10} \mathbf{j}\\\text{(C) } -\frac{1}{\sqrt{10}} \mathbf{i}+\frac{3}{\sqrt{10}} \mathbf{j}\end{array}
\(\begin{array}{l}\text{(D) } \frac{1}{\sqrt{10}} \mathbf{i}-\frac{3}{\sqrt{10}}\mathbf{j}\\\text{(E) } -\frac{1}{\sqrt{8}} \mathbf{i}+\frac{3}{\sqrt{8}} \mathbf{j}\end{array}\)
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