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Mathematics · 2023 · 1 mark
CBSE 2023 · Region 5 · Set 2 · Q14
A unit vector a makes equal but acute angles on the co-ordinate axes. The projection of the vector a on the vector b =5 i +7 j - k is
A unit vector $\displaystyle \hat{a}$ makes equal but acute angles on the co-ordinate axes. The projection of the vector $\displaystyle \hat{a}$ on the vector $\displaystyle \vec{b}=5 \hat{i}+7 \hat{j}-\hat{k}$ is
Official answer
(A)
$\displaystyle \frac{11}{15}$
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