What is friction? A. f net= ma B. the normal force C. the wearing down of surfaces D. forces opposing the motion of surfaces in contact with each other

D. Forces opposing the motion of surfaces in contact with each other

Explanation:

Friction moves in the opposite direction of the object.

that would be because of both gravity and friction. so     c

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards