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5) Three perfectly elastic spheres A, B and C have masses 3m, 2m, m respectively. They are lying in a straight line on a

5) Three perfectly elastic spheres A, B and C have masses 3m, 2m, m respectively. They are lying in a straight line on a horizontal plane and A is projected with speed u to collide directly with B which goes on to collide directly with C. Find the speed of each sphere after the second impact. Explain why there will be no further impacts.

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