a 0.33 kg mass attached to one end of a spring is executing simple harmonic motion. The amplitude of the motion is 14 cm and its velocity is 3.7 m/s as it passes through the equilibrium position. What is the spring constant for the spring? [please show work] 120 N/m, 81 N/m, 230 N/m, 470 N/m, 140 N/m