The time period of oscillation of a simple pendulum of length \( \mathrm{L} \) suspended from th...

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The time period of oscillation of a simple pendulum of length \( \mathrm{L} \) suspended from the roof of a vehicle, which moves without friction down an inclined plane of inclination \( \alpha \), is given by.
(a) \( 2 \pi \sqrt{L /(g \cos \alpha)} \)
(b) \( 2 \pi \sqrt{L /(g \sin \alpha)} \)
(c) \( 2 \pi \sqrt{L / g} \)
(d) \( 2 \pi \sqrt{L /(g \tan \alpha)} \)
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