A person jumps from a height on soft sand. Which one of the following is the correct reason for less likely injury to the person?
- A. The sand exerts no reaction force.
- B. The sand reduces the change in momentum.
- C. The sand increases the impact time. ✓
- D. The sand increases the momentum.
Correct Answer: C. The sand increases the impact time.
Explanation
Soft sand yields upon impact, increasing the time duration of the collision. This significantly reduces the average impact force on the person.
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