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If $\vec{a}$ and $\vec{b}$ are two non-collinear unit vectors, then projection of $\vec{a}+\vec{b}$ on $\vec{a}-\vec{b}$ is equal to: |
2 -2 1 None of these |
None of these |
$(\vec{a}+\vec{b}) . (\vec{a}-\vec{b})=|\vec{a}|^2-|\vec{b}|^2=0$ Thus projection of $\vec{a}+\vec{b}$ on $\vec{a}-\vec{b}$ is zero. Hence (4) is correct answer. |
