A projectile is fired with a speed \( u \) at an angle \( \theta \) with the horizontal. Its spe...

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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:
(1) \( u \sec \theta \cos \alpha \)
(2) \( u \sec \theta \sin \alpha \)
(3) \( u \cos \theta \sec \alpha \)
(4) \( u \sin \theta \sec \alpha \)
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