Answer :


Given:


Acceleration of the elevator =


Mass of the block =


Apparent weight due to pseudo force =


In equilibrium, we have,




When the additional mass of 1kg is added,


Apparent weight of the block becomes


=


In equilibrium, we have, apparent weight=kx


35.4 N=100 × x



Now as per the question we are asked to find further elongation,


further elongation = elongation due to 3kg - elongation due to 2kg




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