Final answer:
Scale readings in a Class B freight elevator are equal to the person's weight when the elevator is moving with a constant velocity.
Step-by-step explanation:
In this scenario, the subject being discussed is physics. The specific topic is the concept of scale readings in a Class B freight elevator. Scale readings in elevators are directly related to the force experienced by a person inside the elevator.
In this case, the scale reading of 735 N is equal to the person's weight. This is true whether the elevator is moving up, moving down, or stationary as long as it is moving with a constant velocity. This is because the force exerted by the elevator on the person is equal to their weight.