(Answered) 1 what are the internal and external force on this system2

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1. What are the internal and external force on this system?

2. What is the net work being done on the system

3. What is the change in kinetic energy of the system(earth is stationary)

4. Is your answer for the change in kinetic energy for the book depend on whether the earth was part of the system? Explain why it changed or is the same.

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