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A simple pendulum has time period 't'. Its time period in a lift which is moving upwards with acceleration $3 ms ^{-2}$ is
  • A$t \sqrt{\frac{9.8}{12.8}}$
  • B$t \sqrt{\frac{12.8}{9.8}}$
  • C$t \sqrt{\frac{9.8}{6.8}}$
  • D$t \sqrt{\frac{6.8}{9.8}}$
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