$A$ projectile is fired with a speed $u$ at an angle $\theta$ with the horizontal. Its speed when its direction of motion makes an angle $\alpha$ with the horizontal is
- A$u \sec \theta \cos \alpha$
- B$u \sec \theta \sin \alpha$
- C$u \cos \theta \sec \alpha$
- D$u \sin \theta \sec \alpha$
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