Elongation in rod

An elastic rod of costant kk and length ll is hung at a point P, rod have a massless lock at the other end. A smooth ring of mass mm 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=10l=30, m=20, k=10, g=10

  • All the values above are in SI units

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