With a load of 500 N suspended from the bottom of a spring, the load was pulled down 35 mm and released, after 17 full oscillations, the amplitude of oscillation was reduced to 15 mm. The time taken for the 17 oscillations was 9 seconds.
Determine the undamped natural frequency of the spring/mass system and the damped natural frequency of the spring/mass system. Explain the difference between undamped natural frequency and damped natural frequency.