Oscillations

Physics
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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 unstretched state and then released, it will go down by 2cm

before moving upwards.
C
The frequency of oscillation will be nearly 5 Hz
D
If the system is taken to the moon, the frequency of oscillation will be the same as on the earth.
Hard
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The angular frequency of a spring block system is  This system is suspended from the ceiling of anelevator moving downwards with a constant speed v. The block is at rest relative to the elevator. Lift issuddenly stopped. Assuming the downwards as a positive direction, choose the wrong statement:

A
The amplitude of the block is
B
The initial phase of the block is
C
The equation of motion for the block is t.
D
The maximum speed of the block is v.
Hard
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