A circular disc having a mass of 30 kg is mounted symmetrically between two bearings A and B as shown above in the figure. It is used as an eccentric cam with an eccentricity of 0.01 m. If the shaking force on each of the bearings is not to exceed 1500 N, the speed of rotation of the cam should not exceed
(a) 10 rad/s (b) 100 rad/s
(c) 70.7 rad/s (d) 140 rad/s