Converting
releases
absorbs
cooling
transfer
liberating
These forces form a force pair. Use Newton's third law, and you see that the trailer pulls back at with the same force. The answer is d.
A natural force of attraction exerted by the earth upon objects, that pulls objects towards earth's center is called<u> </u><u>G</u><u>ravitational</u><u> </u><u>force</u><u> </u><u>.</u>