The mass m = 4 kg. The spring is unstretched when x = 0. The frequency of vibration of the...

The mass m = 4 kg. The spring is unstretched when x = 0. The frequency of vibration of the mass is measured and determined to be 6 Hz. The mass is displaced to the position x = 0.1 m and given a velocity dx/dt = 5 m/s at t = 0. Determine the amplitude of the resulting vibration.