Oscillations

Question: A mass m is suspended by means of two coiled spring which have the same length in unstretched condition as in figure. Their force constant are $k_1$ and $k_2$ respectively. When set into vertical vibrations, the period will be [MP PMT 2001]

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1) $2\pi \sqrt{\left( \frac{m}{{{k}_{1}}{{k}_{2}}} \right)}$
2) $2\pi \sqrt{m\left( \frac{{{k}_{1}}}{{{k}_{2}}} \right)}$
3) $2\pi \sqrt{\left( \frac{m}{{{k}_{1}}-{{k}_{2}}} \right)}$
4) $2\pi \sqrt{\left( \frac{m}{{{k}_{1}}+{{k}_{2}}} \right)}$
Solution: Explanation: No Explanation
Spring mass system combination of springs

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