Final answer:
When the elevator reaches a constant upward velocity, the scale reading will be equal to the person's weight.
Step-by-step explanation:
When the elevator reaches a constant upward velocity, the scale reading will be equal to the person's weight. This is because at a constant velocity, the acceleration is zero, which means that the net force on the person is zero. So the scale will read the person's weight, which is the force exerted on the scale.