Two identical particles move towards each other with velocity \( 2 \mathrm{v} \) and \( \mathrm{...

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Two identical particles move towards each other with velocity \( 2 \mathrm{v} \) and \( \mathrm{v} \) respectively. The velocity of centre of mass is
(a) \( \mathrm{V} \)
(b) \( v / 3 \)
(c) \( \mathrm{v} / 2 \)
(d) zero.
\( \mathrm{P} \)
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