Solve the all parts of following question:
Question: A mass less spring with spring constant 15.1 N/m hangs vertically. A body of mass 0.26 kg is attached to its free end and then released. Assume that the spring was unscratched before the body was released.
Part I: How far below the initial position does the body descend?
Part II: What is the period of oscillation of the resulting motion, assumed to be simple harmonic?
Part III: What is the amplitude of the resulting motion?
Please explain each step and equations used for above question.