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Question

The blocks are initially in equilibrium position then the minimum compression in the spring from its natural length so that the block of 2m leaves contact with the surface is  nmgk, where n equals to 



Your Answer
A

1

Your Answer
B

2

Your Answer
C

3

Correct Answer
D

4


Solution

The correct option is D

4


2m will leave the ground when spring is expanded by x2 such that kx2=2mg…..(1)
If it is initially compress by x1 from natural length
12kx21=mg(x1+x2)+12kx22
After solving x1=4mgk

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