A mass of $0.2\,kg$ is attached to the lower end of a massless spring of force-constant $200\, N/m,$ the upper end of which is fixed to a rigid support. Which of the following statements is/are true ?
  • AIn equilibrium, the spring will be stretched by $1\,cm.$
  • BIf the mass is raised till the spring is unstretched state and then released, it will go down by $2\,cm$ before moving upwards.
  • CThe frequency of oscillation will be nearly $5\, Hz.$
  • D
    all of the above
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