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 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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