The amplitude of vibration of a simple spring mass system is

Question

1. A single degree freedom spring mass is subjected to a sinusoidal force of 10 N amplitude and frequency $\omega$ along the axis of the spring. The stiffness of the spring is 150N/m, damping factor is 0.2 and undamped natural frequency is 10$\omega$. At steady state, the amplitude of vibration (in m) is approximately                            

            (a) 0.05         (b) 0.07         (c) 0.70          (d) 0.90