$A$ block is placed on a frictionless horizontal table. The mass of the block is $m$ and springs are attached on either side with force constants $K_1$ and $K_2$. If the block is displaced a little and left to oscillate,then the angular frequency of oscillation will be

  • A
    $[\frac{K_1 + K_2}{m}]^{1/2}$
  • B
    $[\frac{K_1 K_2}{m(K_1 + K_2)}]^{1/2}$
  • C
    $[\frac{K_1 K_2}{(K_1 - K_2)m}]^{1/2}$
  • D
    $[\frac{K_1^2 + K_2^2}{(K_1 + K_2)m}]^{1/2}$

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