A body is subjected to a force of module F constant and parallel to the support plane; it is verified that the resulting motion is rectilinear and uniform with speed V.
From this we conclude that the friction force:
A) is orthogonal to the plane of motion
B) is equal and opposite to the force F
C) is = 0
D) is half the force F and has the same direction and sense
E) is half the force F and has the same direction and opposite sense
i thought it should be E) but the answer is B). How can the body move if the friction is equal and opposite??