A box of mass 8 kg ios placed on a roulgh inclined plane of inclination 30^(@) Its downward motion cn be prevented byu applying a horizontal force F, then value of F for which friction between the block and the incline surface is minimum is

A box of mass 8 kg ios placed on a roulgh inclined plane of inclinatio

1.	A box of mass 8 kg ios placed on a roulgh inclined plane of inclination 30^(@) Its downward motion cn be prevented byu applying a horizontal force F, then value of F for which friction between the block and the incline surface is minimum is
Answer» `80/sqrt(3)` `40sqrt(3)` `40/sqrt(3)` `80sqrt(3)` ANSWER :B