dislacement? zero, it ends where it started.
The second paragraph requires some thinking. I will be happy to critique your thinking, but won't do it for you.
A particle vibrates in Simple Harmonic Motion with amplitude. What will be its displacement in one time-period
if you attach a mass to the spring from its initial equilibrium position, it vibrates forever in simple harmonic motion. Why doesn't it come to rest after stretching by a distance 'd'; proportional to the weight of the mass, when the spring's restoring force cancels out the weight of the mass? How will you measure the equilibrium position? How can you attach the mass to the spring so that it doesn't oscillate when you let go?
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k but i really don't understand this topic at all...
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