First slide

Motion in a plane

Question

The direction cosines of a vector $\large \vec A$ of magnitude 5√2 are $\large \cos \alpha = \frac{4}{{5\sqrt 2 }}$ , $\large \cos \beta = \frac{1}{{\sqrt 2 }}$ and $\large \cos \gamma = \frac{3}{{5\sqrt 2 }}$ then the vector $\large \vec A$ is

Moderate

A

$4\hat i + \hat j + 3\hat k$
B

$4\hat i + 5\hat j + 3\hat k$
C

$4\hat i - 5\hat j - 3\hat k$
D

$\hat i + \hat j - \hat k$

Solution

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