Suppose the ceiling in the previous problem is that of an elevator which is going up with an acceleration of 2 m/s2. Find the elongations.
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
1