$A$ 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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