(b) A light helical spring, for which the force necessary to produce unit extension is k, hangs vertically from a fixed support and .carries a mass M at its lower end. Assuming that Hooke's law is obeyed and that there is no damping, show that if the mass is displaced in a vertical. direction from its equilibrium position and released, the subsequent motion is simple harmonic. Derive an expression for the time period in terms of M and k.
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