Solve this following
Question:

i. Find the projection of $\overrightarrow{\mathrm{a}}$ on $\overrightarrow{\mathrm{b}}$ if $\overrightarrow{\mathrm{a}} \cdot \overrightarrow{\mathrm{b}}=8$ and $\overrightarrow{\mathrm{b}}=(2 \hat{\mathrm{i}}+6 \hat{\mathrm{j}}+3 \hat{\mathrm{k}})$.

ii. Write the projection of the vector $(\hat{\mathrm{i}}+\hat{\mathrm{j}})$ on the vector $(\hat{\mathrm{i}}-\hat{\mathrm{j}})$.

Solution:

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