A projectile is projected with speed \( u \) making an angle \( 2 \theta \) with the horizontal....

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A projectile is projected with speed \( u \) making an angle \( 2 \theta \) with the horizontal. What is the speed when its direction of motion makes an angle \( \theta \) with the horizontal [BCECE 2006]
(a) \( (u \cos 2 \theta) / 2 \)
(b) \( u \cos \theta \)
(c) \( u(2 \cos \theta-\sec \theta) \)
(d) \( u(\cos \theta-\sec \theta) \)
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