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  4. (P+Q) is a unit vector along X-axis .If p= hati- hatj+ hatK then what is barQ

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Q. $(\overrightarrow{P}+\overrightarrow{Q})$ is a unit vector along X-axis .If $\overrightarrow{p}=\hat{i}-\hat{j}+\hat{K}$ then what is $\bar{Q}$

Motion in a Plane

Solution:

Correct answer is (b) $\hat{j}-\hat{K}$