The answer is (a). A mass m = 102 g is hung from a vertical spring. The equilibrium position is at y = 0. The mass is then pulled down a distance d = 10 cm from equilibrium and released at t = 0. The measured period of oscillation is T = 0.8 s. k What is the spring constant k? Write down the equations for the position, velocity and acceleration of the mass as a function of time. What is the maximum velocity? What is the maximum acceleration? K = What are the equations of motion?