Question

A box of mass 8 kg is placed on a rough inclined plane of inclination 30°. Its downward motion can be prevented by applying a horizontal force F, then value of F for which friction between the block and the incline surface is minimum, is

• A. $\frac {80}{\sqrt 3}$
• B. $40 \sqrt 3$
• C. $\frac {40}{\sqrt 3}$
• D. $80 \sqrt 3$

Answer 1

Answer: (A)

$\frac {80}{\sqrt 3}$

Answer 2

The correct option is (A): $\frac {80}{\sqrt 3}$.