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At an instant t=0, Block A of mass 1 kg ...

At an instant t=0, Block A of mass 1 kg is moving with speed g m/s towards right on rough surface of block B of mass 3 kg. Block B, which is placed on smooth horizontal surface is moving with speed 4 m/s towards right at same instant (t=0). The net work done by the frictional force in long time is (block A will not fall from block B)

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