Final answer:
The correct answer is c) Air resistance. When a person is on a zip wire, the air resistance or drag force opposes their motion and can slow them down.
Step-by-step explanation:
The subject of this question is Physics. The question asks about the factors that affect the speed of zip wires. The correct answer is c) Air resistance. When a person is on a zip wire, the air resistance or drag force opposes their motion and can slow them down. Alan, who swings about on his journey, experiences more air resistance and travels the shortest distance. Dabir, who lies back so his body is vertical, experiences less air resistance and travels a longer distance. Harum, who makes a star shape, experiences the least air resistance and travels the longest distance.