A particle is thrown with a speed $u$ at an angle $\theta$ with the horizontal. When the particle makes an angle $\phi$ with the horizontal, its speed changes to $v$, where

  • A

    $v=u \cos \theta$

  • B

    $v=u \cos \theta \cos \phi$

  • C

    $v=u \cos \theta \sec \phi$

  • D

    $v=u \sec \theta \cos \phi$

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