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What happens when a tractor backs under a trailer?

A. The trailer will be lifted slightly.
B. It will be lowered slightly.
C. The trailer will remain unaffected.
D. The trailer will detach from the tractor.

Answer :

Final answer:

When a tractor backs under a trailer, the trailer will be lowered slightly.

Explanation:

When a tractor backs under a trailer, the trailer will be lowered slightly.

As the tractor exerts a force on the trailer, it accelerates it, increasing its kinetic energy. If frictional forces on the trailer are negligible, the increase in the trailer's kinetic energy can be found using the same algebra that is used to find potential energy due to gravity. Just as in example b, the increase in height is the same as the distance the tractor travels, causing the trailer to be lowered slightly.

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