A cylinder of radius R is confined to roll without slipping between two planks (above plank moving with velocity v towards right and lower plank with velocity 3v towards right) as shown in the figure. Then
a.) angular velocity of the cylinder is V/R counter clockwise.
b.) angular velocity of the cylinder is 2V/R clockwise
c.) velocity of centre of mass of the cylinder is v towards left
d.) velocity of centre of mass of the cylinder is 2v towards right.