A cylinder of radius 'R' is placed on a plank as shown in the figure. If the plank is being pulled with the constant velocity 'v' then-

The angular velocity of the cylinder is zero
the speed of the center of mass of the cylinder is '2v'
the speed of the center of mass of the cylinder is zero.
the angular velocity of the cylinder is .
If the plank is pulled by the constant velocity 'v' then the velocity of the top point of the cylinder should also be 'v'.

If the cylinder is not slipping then,