An object of $m\, kg$ with speed of $v\, m/s$ strikes a wall at an angle $\theta$ and rebounds at the same speed and same angle. The magnitude of the change in momentum of the object will be
$2m\,v\,\cos \theta $
$2\,m\,v\,\sin \theta $
$0$
$2\,m\,v$
The magnitude of a given vector with end points $ (4, -4, 0)$ and $(-2, -2, 0)$ must be
Which pair of the following forces will never give resultant force of $2\, N$
A person moves $30\, m$ north and then $20\, m$ towards east and finally $30\sqrt 2 \,m$ in south-west direction. The displacement of the person from the origin will be
Two forces having magnitude $A$ and $\frac{ A }{2}$ are perpendicular to each other. The magnitude of their resultant is
What is the angle between $\overrightarrow P $ and the resultant of $(\overrightarrow P + \overrightarrow Q )$ and $(\overrightarrow P - \overrightarrow Q )$