Two particle which are initially rest, move P towards each other un...

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Two particle which are initially rest, move
P towards each other under the action of their

W internal attraction. If their speeds are \( \mathrm{v} \) and \( 2 \mathrm{v} \) at any instant, then the speed of centre of mass off the system will be:-
(1) \( \mathrm{V} \)
(2) \( 2 \mathrm{~V} \)
(3) zero
(4) \( 1.5 \mathrm{v} \)
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