Q137. A boy is sitting on the horizontal platform of a joy wheel at a distance of 5m from the centre

Q137. A boy is sitting on the horizontal platform of a joy wheel at a distance of 5m from the centre. The wheel begins to rotate and when the angular speed exceeds 1 rad/s, the body just slips. The coefficient of friction between the boy and the wheel is : (g= 10 m/s2) (1) 0.5 (2) 0.32 (2) 0.71 (3) 0.2