A cork is submerged in water by a spring attached to the bottom of a pail. When the pail is kept in a elevator moving with an acceleration downwards, the spring length
Text Solution
Verified by ExpertsThe correct answer is:
B
Density of cork = d, Density of water = ρ ρ
Resultant upward force on cork 
This causes elongation in the spring. When the lift moves down with acceleration a, the resultant upward force on cork 
which is less than the previous value. So the elongation decreases.
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