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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Two particles of masses m1 and m2{m_1}\,and\,{m_2} initially at rest start moving towards each other under their mutual force of attraction. The speed of the centre of mass at any time tt, when they are at a distance rr apart, is
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Correct option: A
Zero
Option A (Zero) is correct because there is no external force acting on the system, and the center of mass was initially at rest.

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