Renee is on Spring Break and pulling her 21-kg suitcase through the airport at a constant speed of 0.47 m/s. She pulls on the strap with 120 N of force at an angle of 38° above the horizontal. What is the normal force and the total resistance force (friction and air resistance) experienced by the suitcase? I do not understand how to find the forces since it is constant speed and not acceleration. I also don't know how the angle is relative to this question.