Two objects interact with each other and with no other objects. Initially object

Question

Two objects interact with each other and with no other objects. Initially object A has a speed of 5 m/s and object Bhas a speed of 10 m/s. In the course of their motion they return to their initial positions. Then A has a speed of 4 m/s and B has a speed of 7 m/s. We can conclude: A. the potential energy changed from the beginning to the end of the trip B. mechanical energy was increased by nonconservative forces C. mechanical energy was decreased by nonconservative forces D. mechanical energy was increased by conservative forces E. mechanical energy was decreased by conservative forces I found a question just like this on chegg and the answer was E, but wiley said it was wrong... and I have limited tries

Explanation / Answer

option C.

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