Maximum compression of a spring between two moving blocks

1. A.
   $v\sqrt{\frac{m}{2K}}$
2. B.
   $\sqrt{\frac{mv}{2K}}$
3. C.
   $\sqrt{\frac{mv}{K}}$
4. D.
   $\sqrt{\frac{m}{2K}}$

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1. A.
   $\frac{V}{2\sqrt{2}}$
2. B.
   $\frac{V}{2}$
3. C.
   $\frac{V}{4}$
4. D.
   $\frac{V}{\sqrt{2}}$

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