Spring constant when a spring is cut or springs are joined in series

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

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1. A.
   15
2. B.
   20
3. C.
   60
4. D.
   45

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

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