Mark against the correct answer in each of the following:

Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

What is the projection of $\vec{a}=(2 \hat{j}-\hat{j}+\hat{k})$ on $\overrightarrow{\mathrm{b}}=(\hat{\mathrm{i}}-2 \hat{\mathrm{j}}+\hat{\mathrm{k}})$ $?$

A. $\frac{2}{\sqrt{3}}$

B. $\frac{4}{\sqrt{5}}$ 

C. $\frac{5}{\sqrt{6}}$

D. none of these

Solution:

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