what is centre of mass, derive the formula for velocity of center of mass.
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The center of mass velocity is the sum of each mass's momentum divided by the total mass of the system. The acceleration of the center of mass is the sum of all of the products of each mass and its acceleration divided by the total mass: Since Σ F = ma, we can subsititue each ma with is corresponding force, F.
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Centre of mass for a circular ring is at its centre
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