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NEET 2010 (AIPMT, Prelims) · Motion of Centre of Mass

Motion of Centre of Mass question from NEET 2010 (AIPMT, Prelims)

Q12NEET 2010 · AIPMT · PRELIMSEasy

Motion of Centre of Mass

Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be:

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Answer: (b)

Internal attraction only, and the system starts at rest, so total momentum stays zero.
$v_{cm} = \frac{\vec{p}_{total}}{M} = 0$
So the answer is (b) zero.

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