State the $SI$ units of angular velocity and angular acceleration.

If the direction of motion of an object performing uniform circular motion is reversed,what will be the effect on the direction of the centripetal force?

If a particle moves in a circle describing equal angles in equal times,its velocity vector

The angular velocity of a flywheel making $120$ revolutions per minute is:

$A$ particle is moving with a constant speed $v$ in a circle. What is the magnitude of average velocity after half rotation?

$A$ particle is moving on a circular path with constant speed $v$. It moves between two points $A$ and $B$,which subtend an angle $60^{\circ}$ at the centre of the circle. The magnitude of the change in its velocity and the change in the magnitude of its velocity during motion from $A$ to $B$ are respectively ..........