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A particle is pojected from the ground a...

A particle is pojected 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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The correct Answer is:
A
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