troubleshooting Question

Why change in total kinetic energy is same for Two different systems ?

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naseeamFlag for United States of America asked on
Math / Science* Physics
3 Comments1 Solution268 ViewsLast Modified:
The question is from Physics book titled "Physics for Scientists and Engineers" by Randall D. Knight.  Attached is part of chapter 10.1.

"Objects A and B are oblivious to our choice of system, so change in total kinetic energy for system 2 is exactly the same as for system 1."

How is that possible?  System 1 has kinetic energy because there are external forces but System 2 doesn't have external forces.
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David Johnson, CD
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