A Freight Train Consists of an Engine and Several Identical

question 1

Multiple Choice

A freight train consists of an engine and several identical cars on a straight, level track. Which of the following statements is true?

• A) If the train is moving at constant speed, the engine must be pulling with a force greater than the train's weight.
• B) If the train is moving at constant speed, the engine's pull on the first car must exceed that car's backward pull on the engine.
• C) If the train is coasting, its inertia makes it slow down and eventually stop.
• D) If the train is moving at constant speed, the engine's pull must be equal to the force of friction.

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