A block 'B' rests on 'A' A rests on a ho...

A block 'B' rests on 'A' A rests on a horizontal surface 'C' which is frictionless. There is friction between `A` and `B` If 'B' pulled to the right .

B moves forward and `A` to the left

`'B'` only moves to the left

B' does not move

`'A'` and 'B' move together to the right .

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