1.

Figure shows a man pulling on a string attached to a block kept on a rough block surface. Man is heavier than block. Coefficient of friction is same for both block and man. Subscripts R, B and M denote rope block and man respectively, taking string to be light. Mark the correct statement(s).

Answer»

`vec(F)_(R//B)-vec(F)_(M//R)` always
Block begins to move earlier than MAN if man continues to increase his pull from zero.
`vec(F)_(R//B)and vec(F)_(M//R)` can be action REACTION pairs.
Block can remain static if man walks with constant speed while letting string to pass through his hand.

Solution :`vec(F)_(R//B)` and `vec(F)_(M//R)` both are equal to tension in the rope. FRICTION is lesser for block than that for man. PULLING force tension is same for both of them Friction on block can keep it static.


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