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A mass hangs vertically from a spring that is attached to the ceiling, and oscillates. If...

A mass hangs vertically from a spring that is attached to the ceiling, and oscillates. If the kinetic energy of the mass is decreasing, what must be true about the mass's motion?

The mass must be moving towards the equilibrium position.
The mass must be moving upward.
The mass must be moving away from the equilibrium position.
The mass must be moving downward.
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