Question
Let \( \vec{a}=\hat{i}-\hat{j}+2 \hat{k} \) and \( \vec{b} \) be a vector such that
\( .... VIDEO
Question
Let \( \vec{a}=\hat{i}-\hat{j}+2 \hat{k} \) and \( \vec{b} \) be a vector such that
\( \mathrm{P} \)
\( \vec{a} \times \vec{b}=2 \hat{i}-\hat{k} \) and \( \vec{a} \cdot \vec{b}=3 \). Then the projection of \( \vec{b} \) on the vector \( \vec{a}-\vec{b} \) is
(1) \( \frac{2}{\sqrt{21}} \)
(2) \( 2 \sqrt{\frac{3}{7}} \)
(3) \( \frac{2}{3} \sqrt{\frac{7}{3}} \)
(4) \( \frac{2}{3} \)
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