4. A spring whose constant is 200 N/m can be stretched up to 0.2 meters. a) Draw a graph of Force vs. Stretch for this spring, where stretch ranges from zero to the maximum stretch. Be sure to put an appropriate scale on the graph. [Hint: The spring constant does NOT go on the y-axis!] b) If the spring is set vertically and a mass of 2.8 kg hangs from it, what is the stretch of the spring? Mark this point on the graph. Force (Newtons) Stretch (meters) c) If the spring is stretched from zero to 0.12 m, what | d) How much work must be done to stretch the is the potential energy stored in the spring? spring from 0.06 meters to 0.16 meters? Show what this quantity represents on the graph.