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Two identical uniform discs roll without...

Two identical uniform discs roll without slipping on tow different sufaces AB and CD (see figure) starting at A and C with linear speeds `v_1 and v_2` respectively, and always remain in contact with the surfaces. If they reach B and D with the same linear speed `v_1= 3m//s then v_2 in m//s is (g = 10 m//s^2)`

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