Can you please help me figure out this problem.

12. (5 points) A speaker playing a single tone is attached to a vertical spring and set into oscillation above a microphone. At point A, the speaker is moving downward through the equilibrium point. At point D, the speaker is moving upward through the equilibrium point. Points B and C are the turning points of the oscillation. Rank the frequency recorded by the microphone for these four points of the motion. Explain the reasoning behind your ranking. N Equilibrium Microphone