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A projectile is fired at angle \( \theta \) with horizontal. When the particle makes an angle \( \beta \) with the horizontal, its speed becomes \( v . v \) is given by
(A) \( v=u \cos \theta \cdot \sec \beta \)
(B) \( v=u \cos \theta \cdot \sin \beta \)
(C) \( v=u \cos \theta \cdot \cos \beta \)
(D) \( v=u \cos \theta \cdot \operatorname{cosec} \beta \)
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