A mass is vibrating at the end of a spring of force constant 225 N/m. The figure below (Figure 1) shows a graph of its position x as a function of time t. Part A At what times is the mass not moving? Express your answers in seconds, separated by commas, to two significant figures. Figure x (cm) 5 t1, t2, t3, t4, t5 = Submit Request Answer Part B How much energy did this system originally contain? Express your answer in joules to two significant figures. Eo = Submit Request Answer Part C 1 of 1 ? J ? S How much energy did the system lose between t = 1.0 s and t = 2.0 s? Express your answer in joules to two significant figures. | E2-E = -t(s) 1 2 3 4 Submit Request Answer Provide Feedback ? J