Vectors

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Question

Which of the following is a unit vector?

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Solution

$\begin{array}{l} \vec{A} = A_{x} \hat{i} + A_{y} \hat{j} \\ m a g n i t u d e A = \sqrt{{A_{x}}^{2} + {A_{y}}^{2}} = 1 f o r u n i t v e c t o r \end{array}$

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