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A stone of mass and spring constant k. T...

A stone of mass and spring constant k. The unstrecthed length of the string is L and has negligible mass. The other end of the string is fixed to a nail at a point P. Initially the stone is at the same level as the point P. The stone is dropped vertically from point P.
Find the distance y from the top when the mass comes to rest for an instant, for the first time.

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