The period of oscillation of a simple pendulum of length $L$ suspended from the roof of a vehicle which moves without friction down an inclined plane of inclination $\alpha$, is given by
  • A$2\pi \sqrt {\frac{L}{{g\cos \alpha }}} $
  • B$2\pi \sqrt {\frac{L}{{g\sin \alpha }}} $
  • C$2\pi \sqrt {\frac{L}{g}} $
  • D$2\pi \sqrt {\frac{L}{{g\tan \alpha }}} $
IIT 2000,JEE MAIN 2022, Medium
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