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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