16. A5 kg mass is attached to a spring. The mass is drawn back 10 cm from the equilibrium position and released. Take this direction to be the positive x direction, so that this displacement is x= +10 cm. After 0.5 s have passed, the mass reaches x= -5 cm for the first time. What is the spring constant of this spring? a. 119 N/m b. 304 N/m 15.4 N/m d. 87.7 N/m e. 70.5 N/m C.
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