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A particle is projected from the ground ...

A particle is projected from the ground at an angle `30^@` with the horizontal with an initial speed `20 m s^-1`. After how much time will the velocity vector of projectile be perpendicular to the initial velocity ? [in second].

A

`u//(g sin theta)`

B

`u//(g cos theta)`

C

`2u/(g sin theta)`

D

`2u tan theta`

Text Solution

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The correct Answer is:
A
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