An elastic rod of costant and length is hung at a point P, rod have a massless lock at the other end. A smooth ring of mass 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.
All the values above are in SI units