In the figure shown, a block A of mass m is rigidy attached to a light spring of stiffness k and suspended from a fixed support. Another block B of same mass is just placed on it and blocks are in equilibrium. Suddenly the block B is removed. Choose the correct options (s) afterward.
A. Block A will start SHM
B. Amplitude of oscillation of the block A is `(mg)/k)`
C. Maximum speed acquired by the block A is `sqrt(m/(2k))`
D.