The coefficient of kinetic friction between a 20-kg box and the floor is 0.40. A pulling force is directed 37o above the horizontal. How much work does the pulling force do on the box in pulling it 8.0 m across the floor at a constant speed? What if the force pushes rather than pulls on the box and is directed 37 below?

The coefficient of kinetic friction between a 20-kg box and the floor is 0.40. A pulling force is directed 37o above the horizontal. How much work does the pulling force do on the box in pulling it 8.0 m across the floor at a constant speed? What if the force pushes rather than pulls on the box and is directed 37 below?