A stationary horizontal disc is free to rotate about its axis. When a torque is applied on it, its kinetic energy as a function of , where is the angle by which it has rotated, is given as k . If its moment of inertia is I then the angular acceleration of the disc is : 

(a) 
(b) 
θ 

(c) 
(d) 
A stationary horizontal disc is free to rotate about its axis. When a torque is applied on it, its kinetic energy as a function of , where is the angle by which it has rotated, is given as k . If its moment of inertia is I then the angular acceleration of the disc is : 

(a) 
(b) 
θ 

(c) 
(d) 