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 0, where is the angle by which it has rotated, is given as k0². If its moment of inertia is I, then the angular acceleration of the disc is k (a) 0 21 (b) k -0 I (c) k -0 47 2k (d) -0 I
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