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Banking of Roads

Three particl...

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Three particles A (m=2kg) B (m=1kg) and C (m=1kg) are placed on the vertices P,Q,R respectively of an equilateral triangle PQR. Velocity of A is 1m/s along PQ, B is 1m/s along QR, and C is 1m/s along RP. What is velocity of the centre of mass?

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