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Block A of mass 1kg is placed on the rough surface of Block B of mass 3kg. Block B is placed on smooth horizontal

Block A of mass 1kg is placed on the rough surface of Block B of mass 3kg. Block B is placed on smooth horizontal surface. Blocks are given the velocities as shown in the figure. Net work done by friction is found as - x joule. What is x? A 8m/s B 4m

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