Answer :


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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Figure <span langPhysics - Exemplar

Figure <span langPhysics - Exemplar

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