A projectile is thrown with velocity \( v \) making an angle \( \theta \) with the horizontal. I...

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A projectile is thrown with velocity \( v \) making an angle \( \theta \) with the horizontal. It just crosses the top of two poles, each of height \( h \), after 1 second and 3 second respectively. The time of flight of the projectile is
(a) \( 1 \mathrm{~s} \)
(b) \( 3 \mathrm{~s} \)
(c) \( 4 \mathrm{~s} \)
(d) \( 7.8 \mathrm{~s} \).
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