Q5 of 101 Page 131

The work done by the external forces on a system equals the change in

The work done by all the forces acting on the system (both internal and external forces) contributes to the change in total energy.

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The negative of the work done by the conservative internal forces on a system equals the change in

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The work done by all the forces (external and internal) on a system equals the change in

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_________ of a two particle system depends only on the separation between the two particles. The most appropriate choice for the blank space in the above sentence is