A20 lb object suspended by a vertical spring stretches it by 6 inches. a) determine the position of the object as a function of time if it was initially pulled down by 2 inches and then let go. find the amplitude, period, and frequency of motion. b) do the above for springs with damping coefficients: 0ib-s/ft i8 lb-s/ft ili) 10 ib-s/ft iv) 12.5 lb-s/ft