A mass of `0.2kg` 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?
A. In equilibrium, the spring will be stretched by `1cm`.
B. If the mass is raised till the spring is unstreched state and then released, it will godown by `2cm` before moving upwards.
C. The frequency of oscillation will be nearly `5Hz`.
D. If the system is taken to the moon, the frequency of oscillation will be the same as on the earth.
