A Freight Train Consists of an Engine and Several Identical

question 10

Multiple Choice

A freight train consists of an engine and several identical cars on a 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 friction

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