Final answer:
The force of friction acting on a 2.8 kg box, which is being moved by a 188 Newton force at constant velocity, is 188 Newtons.
Step-by-step explanation:
The student has asked for the force of friction encountered by a 2.8 kg box being moved across a level surface by a 188 Newton horizontal force at a constant velocity. According to Newton's First Law of Motion, an object moving at constant velocity has no net external force acting upon it. This implies that the force of friction must equal the applied force if the velocity is constant. Therefore, the force of friction opposing the motion of the box is also 188 Newtons.