A vertical spring-mass system undergoes damped oscillations due to air resistance. The spring constant is 2.40 x 104 N/m and the mass at the end of the spring is 17.3 kg. (a) If the damping coefficient is b = 4.50 N s/m, what is the frequency of the oscillator? Hz (b) Determine the fractional decrease in the amplitude of the oscillation after 3 cycles.