A particle is projected from point \(P\) with velocity \(5 \sqrt{3} ms ^{-1}\) perpendicular to ....

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A particle is projected from point \(P\) with velocity \(5 \sqrt{3} ms ^{-1}\) perpendicular to the surface of a hollow right angled cone as shown in figure. It collides at \(Q\) normally. What will be the velocity with which it collides at \(Q\) ?
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