A 12 pound weight placed on the lower end of a coil spring comes to rest at its equilibrium position =1.50 in below its unstretched position. a. Determine the system's amplitude, period and circular natural frequency, if its initial displacement is 2.0 in below equilibrium (2 inches more than the stretching due to weight) and its initial velocity is 24.0 in/s downward. b. Discuss how the amplitude, period and circular natural frequency would change if the initial displacement was zero. (Comments should be in the form, "a zero initial displacement causes the amplitude increase, the period to ..,")