To determine whether Callie or Jerry is feeling the most pull from Earth's gravity, you need to consider their respective distances from the center of the Earth. According to the law of universal gravitation, the gravitational force acting on an object depends on its mass and the distance from the center of the Earth.
If Callie and Jerry are at different elevations on the mountain, the one at the lower elevation (closer to sea level and therefore closer to the center of the Earth) will experience slightly stronger gravitational pull than the one at a higher elevation. However, the difference in gravitational pull at heights typical for mountains is relatively small.
If both hikers are quite close in elevation, their experiences of Earth's gravity would be nearly the same, and other factors might affect their personal perception of weight (such as their mass).
To summarize, you can determine who feels the most pull from Earth's gravity by comparing their elevations. The one at the lower elevation (closer to sea level) will feel the most pull, while the one higher up will feel a slightly lesser gravitational pull.
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