The force required to move a body up a rough inclined plane is double the force required to prevent the body from sliding down the plane. The coefficient of friction when the angle of inclination of the plane is 60^(@) is

The force required to move a body up a rough inclined plane is double

1.	The force required to move a body up a rough inclined plane is double the force required to prevent the body from sliding down the plane. The coefficient of friction when the angle of inclination of the plane is 60^(@) is
Answer» `(1)/(sqrt2)` `(1)/(sqrt3)` `(1)/(2)` `(1)/(3)` SOLUTION :`F_("Up")=mg(sintheta +mu_(k)COS theta)`, `F_("down")=mg(sin theta-mu_(k)cos theta)`.