Final answer:
The subject of this question is Physics. It involves the concepts of potential energy and changes in elevation.
Step-by-step explanation:
The subject of this question is Physics. It involves the concepts of potential energy and changes in elevation.
When the mountaineer climbs up, it is considered a positive change as she is increasing her elevation. On the other hand, if she climbs down, it is considered a negative change as she is decreasing her elevation relative to the ground.
In this specific scenario, the mountaineer is 200 feet above the ground. The change in elevation can be represented as +200 feet if she climbs up or -200 feet if she climbs down.