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

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A particle is projected from point \( P \) with velocity \( 5 \sqrt{3} \mathrm{~ms}^{-1} \) perpendicular to the surface of a hollow right angled cone as shown in figure. It collides at \( Q \) normally. The velocity with which it collides at \( Q \) will be
(a) \( 25 \mathrm{~ms}^{-1} \)
(b) \( 15 \mathrm{~ms}^{-1} \)
(c) \( 5 \sqrt{3} \mathrm{~ms}^{-1} \)
(d) \( 10 \sqrt{3} \mathrm{~ms}^{-1} \)
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