# Oscillation of a spring

A spring with spring constant $$100$$ N/m is fixed on the left wall in the above diagram, with an iron ball tied to other end. If we pull the iron ball by $$0.2$$ m to the right, and then release it, the motion of the iron ball will be a harmonic oscillation. If the mass of the iron ball is $$1$$ kg and the floor is frictionless, what is the period of the harmonic oscillation of the iron ball?

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