The magnitude of a given vector with end points $ (4, -4, 0)$ and $(-2, -2, 0)$ must be
$6$
$5\sqrt 2 $
$4$
$2\sqrt {10} $
If vectors $P, Q$ and $R$ have magnitude $5, 12$ and $13 $ units and $\overrightarrow P + \overrightarrow Q = \overrightarrow R ,$ the angle between $Q$ and $R$ is
Write two properties of vector addition.
Two forces having magnitude $A$ and $\frac{ A }{2}$ are perpendicular to each other. The magnitude of their resultant is
The resultant of two vectors at an angle $150^{\circ}$ is $10$ units and is perpendicular to one vector. The magnitude of the smaller vector is ....... units