Spring constant and period when a spring is cut

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

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

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1. A.
   $K(1+n)$
2. B.
   $\frac{K(n+1)}{n}$
3. C.
   $K$
4. D.
   $K(n+1)$

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