What is the linear velocity of a particle in uniform circular motion of radius $A$ and angular velocity $\omega$?

$A$ man is running with constant speed along a circular path of radius $2 \sqrt 2 \, m$. He completes $1$ round in $10 \, s$. Find the instantaneous speed at $2.5 \, s$.

$A$ body is moving with a uniform speed of $20 \,m/s$ on a horizontal circle. The change in velocity of the body in half a revolution is

$A$ motorcyclist going around a circular track at a constant speed has:

$A$ particle completes $2$ revolutions in a circular path of radius $3$ cm. The angular displacement of the particle will be (in radian) (in $\pi$)

If a particle is moving on a circular path with constant speed,then the angle between the direction of acceleration and its position vector w.r.t. the centre of the circle will be ............