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

• A

  $\nu$ = $u$ cos $\theta$

• B

   $\nu$ = $u$ cos $\theta$ cos $\varphi$

• C

  $\nu$ = $u$ cos$\theta$ sec $\varphi$

• D

  $\nu$ = $u$ sec $\theta$ cos $\varphi$