A string is wound around a hollows cylinder of mass 5 kg and radius 0.5 m. If the string is now pulled with a horizontal force of 40 N, and the cylinder is rolling without slipping on a horizontal surface (see figure), then the angular acceleration of the cylinder will be (Neglect the mass and thickness of the string) :
(1) 12 rad/s2
(2) 16 rad/s2
(3) 10 rad/s2
(4) 20 rad/s2
