An object with mass 3.5 kg is pushed up a 40.0 incline with constant speed under the action of a 26 N force acting up and parallel to the incline. The incline has friction.

What is the force of friction?

What magnitude force must act up and parallel to the incline for the object to move down the incline at constant velocity? A sketch is required of the part of this problem while the object is being pushed up AND a separate sketch is required of this problem while the object is moving down with the angle and all forces labeled. An equation showing the sum of the forces in the x direction is required for both parts of this problem.