Two perfectly elastic particles \( P \) and \( Q \) of equal \( \ma...

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Two perfectly elastic particles \( P \) and \( Q \) of equal
\( \mathrm{P} \) mass travelling along the line joining them with velocities \( 15 \mathrm{~m} / \mathrm{sec} \) and \( 10 \mathrm{~m} / \mathrm{sec} \). After collision,
W their velocities respectively (in \( \mathrm{m} / \mathrm{sec} \) ) will be
(1) 0,25
(2) 5,20
(3) 10,15
(4) 20,5
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