Elongation in rod

Classical Mechanics Level 4

An elastic rod of costant \(k\) and length \(l\) is hung at a point P, rod have a massless lock at the other end. A smooth ring of mass \(m\) falls from P (It is the same point from where the rod was hung), find the max elongation in the rod.

Details and Asumptions:

Gravity acts vertically downwards.
Position of ring in picture is not of initial position.
Length l is taken from point P to lock.
\(l=30, m=20, k=10, g=10\)
All the values above are in SI units

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