An automobile that is pulling a trailer is accelerating on a level road. The force that the automobile exerts on the trailer is:

equal to the force the trailer exerts on the automobile

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greater than the force the trailer exerts on the automobile

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equal to the force the trailer exerts on the road

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equal to the force the road exerts on the trailer

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Solution

The correct option is A equal to the force the trailer exerts on the automobile
Newton's 3rd law. The force a body exerts on another gives rise to a reaction equal and opposite in direction. The force trailer exerts on the road is different than that on the automobile.
The automobile exerts force on road greater than that exerting on the trailer.
But the trailer and automobile are an action-reaction pair.

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