A block of mass $m$ is at rest on an another block of same mass as shown in figure. Lower block is attached to the spring, then the maximum amplitude of motion so that both the block will remain in contact is
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The block will remain in contact till the block do not go above the natural length of spring because after this decleration of lower block becomes more than upper block due to spring force so they will get separated
So, $A=\frac {2mg}{K}$
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