Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction__________________?

Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction__________________?

A. along the plane
B. horizontally
C. vertically
D. at an angle equal to the angle of friction to the inclined plane
E. unpredictable

Angle oT friction is the___________________?

Angle oT friction is the___________________?

A. angle between normal reaction and the resultant of normal reaction and the limiting friction
B. ratio of limiting friction and normal reaction
C. the ratio of minimum friction force to the friction force acting when the body is just about to move
D. the ratio of minimum friction force to friction force acting when the body is in motion
E. ratio of static and dynamic friction