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 figure. Choose the $CORRECT$ statement :-
Afor $\mu > \frac{\sqrt 3}{5}$ block will move
Bfor $\mu > \frac{\sqrt 3}{5}$, work done by friction force is zero (in ground frame).
C$\mu > \frac{\sqrt 3}{5}$ friction force will do positive work (in ground frame)
Dfor $\mu > \frac{\sqrt 3}{5}$ block will move
Diffcult
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Dfor $\mu > \frac{\sqrt 3}{5}$ block will move
d $\mathrm{N}=\mathrm{W}+\frac{\mathrm{W}}{2}-\frac{\mathrm{W}}{4}=\frac{5}{4} \mathrm{W}$
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