$A$ mass $m$ is suspended from two coupled springs connected in series. The force constants for the springs are $K_1$ and $K_2$. The time period of the suspended mass will be:
- A$T = 2\pi \sqrt{\frac{m}{K_1 + K_2}}$
- B$T = 2\pi \sqrt{\frac{m(K_1 + K_2)}{K_1 K_2}}$
- C$T = 2\pi \sqrt{\frac{m(K_1 + K_2)}{K_1 K_2}}$
- D$T = 2\pi \sqrt{\frac{m K_1 K_2}{K_1 + K_2}}$
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