A particle is projected from the ground at an angle of $\theta $ with the horizontal with an initial speed of $u$. Time after which velocity vector of the projectile is perpendicular to the initial velocity is
A particle is projected from the ground at an angle of $\theta $ with the horizontal with an initial speed of $u$. Time after which velocity vector of the projectile is perpendicular to the initial velocity is
- A
$u /g\,\, sin\,\, \theta $
- B
$u /g\,\, cos\,\, \theta $
- C
$2u /g\,\, sin\,\, \theta $
- D
$2u \,\, tan\,\, \theta $
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