Final answer:
A correct value for the normal force in an upward accelerating elevator would be greater than the weight of the person, with any value above 450 N being a possibility, depending on the acceleration.
Step-by-step explanation:
A person who weighs 450 N is being accelerated upward in an elevator. A possible correct value for the normal force between the person and the elevator floor could be any value greater than 450 N. This is because the normal force must not only balance the weight of the person but also provide the upward force needed to accelerate the person. If the elevator is accelerating upwards, the normal force is the person's weight plus the force required to accelerate them, calculated using Newton's second law (F=ma).
If the elevator were accelerating upwards at 9.8 m/s2 (which is the acceleration due to gravity, g), the normal force would be twice the weight (in this case, 900 N), since the net force would need to be equivalent to the weight of the person to achieve this acceleration. However, this would be an extreme case, as typical elevators accelerate at much less than g. Therefore, a normal force slightly above 450 N is more reasonable given typical elevator accelerations.