A mass is vibrating at the end of a spring of force constant 375 N/m. The figure below (Figure 1) shows a graph of its position x as a function of time t. .At what times is the mass not moving? Express your answers in seconds, separated by commas, to two significant figures. How much energy did this system originally contain? Express your answer in joules to two significant figures. How much energy did the system lose between t1 = 1.0 s and t2 = 2.0 s? Express your answer in joules to two significant figures.