A) Increases
B) Decreases
C) Remains unchanged
D) Data insufficient
Correct Answer: B
Solution :
Density of cork = d, Density of water = r Resultant upward force on cork\[=V(\rho -d)\,g\] This causes elongation in the spring. When the lift moves down with acceleration a, the resultant upward force on cork\[=V(\rho -d)(g-a)\] which is less than the previous value. So the elongation decreases.You need to login to perform this action.
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