A block of weight `W` is kept on a rough horizontal surface (friction coefficient `mu`). Two forces `W//2` each are applied as shown in the choose the correct statement
.

Options

A. For `mugt(sqrt3)/(5)` block will move .
B. For `mult(sqrt3)/(5)`, work done by frictional force is zero in ground frame .
C. For `mu gt (sqrt3)/(2)` frictional force will do positive work (in ground frame) .
D. For `mu le (sqrt3)/(2)` block will move .

Answer

D

Explanation

`N +(w)/(2) sin theta =w +(w)/(2), f_(max) =muN` .