Time period of a block attached to two springs

1. A.
   $\frac{1}{2\pi}\sqrt{\frac{2k}{Mgsin\alpha}}$
2. B.
   $\frac{1}{2\pi}\sqrt{\frac{k}{Mgsin\alpha}}$
3. C.
   $\frac{1}{2\pi}\sqrt{\frac{2k}{M}}$
4. D.
   $\frac{1}{2\pi}\sqrt{\frac{k}{2M}}$

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

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1. A.
   $\frac{1}{2\pi}\sqrt{\frac{K_{1} + K_{2}}{m}}$
2. B.
   $\frac{1}{2\pi}\sqrt{\frac{K_{1} - K_{2}}{m}}$
3. C.
   $2\pi\sqrt{\frac{m}{K_{1} + K_{2}}}$
4. D.
   $2\pi\sqrt{\frac{m}{K_{1} - K_{2}}}$

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