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The time 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 α , is given by :

1. ) cos g /( L 2 α π
2. ) sin g /( L 2 α π
3. g / L 2 π
4. ) tan g /( L 2 α π

Correct answer: ) cos g /( L 2 α π

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