I think this question is complicated, and I dont even know how to start it off, please help? A mass of 2 kg is hung from the lower end of a spiral spring and extends it by 0.4m. When the mass is displaced a further short distance x and released, it oscillates with acceleration a towards the rest position. If a = -kx and if the tension in the spring is always directly proportinal to its extension, what is the value of the constant k? Please help, this urgent, I am revising for a physics exam that is coming up next week.