Energy consumption in propelling the train is required for which of the following?
Correct answer: D. All of the above
- A. Work against the resistance to motion
- B. Work against gravity while moving up the gradient
- C. Acceleration
- D. All of the above
Explanation
Propelling energy must overcome rolling and air resistance, raise the train against gravity on gradients, and accelerate its mass. Therefore all three listed requirements contribute to energy consumption.
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