A simple pendulum has time period 't'. Its time period in a lift which is moving upwards with acceleration $3 ms ^{-2}$ is
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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