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Given: Two identical uniform discs roll without slipping on 2 different surfaces AB and CD. Starting at A and C the discs rolls with initial velocity v1=3m/s and v2=?m/s, respectively. Both discs have the same linear speed at point B and D.
Find: v2=?m/s let N=? (N can be any number between 1 and 9, inclusively.)

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