The pull of gravity from Earth depends on the distance from the center of the Earth. The farther you are from the center, the weaker the pull of gravity.
Since all four hikers have equal mass, the hiker who is at the highest elevation (i.e., the one that is farthest from the center of the Earth) will feel the least pull of gravity. Therefore, the hiker that is the highest up on the mountain will experience the least gravitational force.
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