Find a Unit Vector in the Direction of U $\mathbf { u } = 10 \mathbf { i } + 5 \mathbf { j } - \mathbf { k }$

question 200

Multiple Choice

Find a unit vector in the direction of u $\mathbf { u } = 10 \mathbf { i } + 5 \mathbf { j } - \mathbf { k }$

• A) \(\frac { u } { \| \mathbf { u } \| } =\) \(\frac { \sqrt { 126 } } { 126 } ( 10 i + 5 j - k )\)
• B) \(\frac { u } { \| \mathbf { u } \| } =\) \(\frac { 126 } { \sqrt { 126 } } ( 10 i + 5 j - k )\)
• C) \(\frac { u } { \| \mathbf { u } \| } =\) \(- \frac { \sqrt { 126 } } { 126 } ( 10 i + 5 j - k )\)
• D) \(\frac { u } { \| \mathbf { u } \| } =\) \(\frac { 1 } { 126 } ( 10 i + 5 j - k )\)
• E) \(\frac { u } { \| \mathbf { u } \| } =\) \(\sqrt { 126 } ( 10 i + 5 j + k )\)

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