The magnitude of vector A→=5i^+j^-2k^ is

The magnitude of vector $\vec{A}$ $= 5 \hat{i} + \hat{j} - 2 \hat{k}$ is

A
$\sqrt{30}$
B
$\sqrt{22}$
C
2
D
$\sqrt{10}$

Solution:

$|A| = \sqrt{5^{2} + 1^{2} + 2^{2}} = \sqrt{30}$

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