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Syllabus

If the resultant of the vector $(\hat{i}+2\hat{j}-\hat{k}),(\hat{i}-\hat{j}+2\hat{k})and\overrightarrow{C}$ is unit vector along the y direction t, tan

$\overrightarrow{C}$ is:

A) - $2\hat{i}$- $\hat{k}$ B) - $2\hat{i}$ + $\hat{k}$ C) $2\hat{i}$ - $\hat{k}$ D) $2\hat{i}$ + $\hat{k}$

In uniform circular motion particle moves with speed 5 m/s, then the change in magnitude of velocity of particle, when it moves from position A to B is