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Three balls A, B and C of masses 2 kg, 4...

Three balls `A, B` and `C` of masses `2 kg, 4 kg` and `8 kg`, respectively, move along the same straight line and in the same direction, with velocities `4m//s,1m//s, 3/4m//s`. If `A` collides with `B` and subse-quently `B` collides with `C`, find the velocity of ball `A` and ball `B` after collision, taking the coefficient of restitution as unity.

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