A body is projected with velocity u making an angle α with horizontal. Its velocity when it is perp

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3-2.Motion in Plane

medium

A body is projected with velocity $u$ making an angle $\alpha$ with the horizontal. Its velocity when it is perpendicular to the initial velocity vector $u$ is

A

$u \,tan\alpha$

B

$u\, cot\alpha$

C

$u\, cosec\alpha$

D

$u \,sec\alpha$

Solution

$'O' = u\cos \alpha $

$'P' = v\sin \alpha $

$v\sin \alpha = u\cos \alpha $

$\Rightarrow \,v = u\cot \alpha $

Standard 11

Physics

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