The resistance encountered by a train in motion is on account of_________________?
Correct answer: D. all of the above
- A. resistance offered by air
- B. friction at the track
- C. friction at various parts of the rolling stock
- D. all of the above
Explanation
Train resistance includes air resistance, friction and rolling resistance at the wheel-track interface, and friction in bearings and other moving parts. Since all listed effects oppose motion, the combined answer is all of the above.
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