Question
The projection of a vector $\vec{r}=3 \hat{i}+\hat{j}+2 \hat{k}$ on the $x-y$ plane has magnitude(A) 3(B) 4(C) $\sqrt{14}$(D) $\sqrt{10}$
Step 1
The projection of this vector on the $x-y$ plane will have the same $x$ and $y$ components as the original vector, but the $z$ component will be zero. Therefore, the projection of the vector on the $x-y$ plane is $3 \hat{i}+\hat{j}$. Show more…
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