The air resistance to the movement of the train is proportional to_____________?
Correct answer: B. (speed)
- A. speed
- B. (speed)
- C. (speed)
- D. 1/speed
Explanation
Air resistance on a train is approximately proportional to the square of its speed, so doubling speed produces about four times the aerodynamic resistance. Option b is interpreted as speed squared despite the damaged formatting.
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