A motor is installed at the top of a pole rigidly fixed on a platform. A light rod of length r = 1 m is rigidly attached to the motor shaft at its one end and at the other end a small ball of mass m is attached. The rod can rotated in a vertical plane with the help of the motor. Total mass of the platform, the pole and the motor is n = 4 times the mass of the ball. The motor rotates the rod at a constant angular velocity. The platform is placed on a horizontal surface, where coefficient of friction is u=1/3. At which minimum angular velocity of the rod, will the platform start sliding? (A) 00) = 2rad/s (B) (0) = 3rad/s (C) (D) (0 = 5rad/s None of these 0 m