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 7 ms/ and object B has a speed of 6 ms/ . In the course of their motion, they return to their initial positions. Then A has a speed of 2 ms/ and B has a speed of 1 ms/ . We can conclude (Select all that apply)

A

the potential energy is unchanged from the beginning to the end of the trip.  

B

mechanical energy was increased by conservative forces.

C

mechanical energy was decreased by nonconservative forces.

D

mechanical energy was increased by nonconservative forces.      

E

mechanical energy was decreased by conservative forces.

Explanation / Answer

because speed reduces, one possible reason is friction and frictional force is nonconservative in nature

option (c) is correct answer

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