Question
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
✓
Answer
$'O' = u\cos \alpha $
$'P' = v\sin \alpha $
$v\sin \alpha = u\cos \alpha $
$\Rightarrow \,v = u\cot \alpha $
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