A rigid spring of spring constant k is fixed to the ceiling of a lift. The other end of the spring is attached to a block of mass me the block hangs in equilibrium. Now the lift starts accelerating downwards with an acceleration 2g. [Assume the length of the spring to be large and its mass is negligible]. Now, 

Options

A. The block would not perform simple harmonic motion and would stick to the ceiling
B. The block performs SHM with time period `T = 2pi sqrt(m/K)`
C. The block performs oscillatory motion but not SHM
D. The block per forms simple harmonic motion with amplitude `(2mg)/(k)`

Answer

B, D