A man pulls a block of mass equal to himself with a light string. The coefficient of friction be...

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A man pulls a block of mass equal to himself with a light string. The coefficient of friction between the man and the floor is greater than that between the block and the floor
(a) if the block does not move, then the man also does not move
(b) the block can move even when the man is stationary
(c) if both move, then the acceleration of the block is greater than the acceleration of man
(d) if both move, then the acceleration of man is greater than the acceleration of block
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