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"The sum of the kinetic and potential energies of a system of objects is conserved: "

"A. only when no external force acts on the objects

B. only when the objects move along closed paths

C. only when the work done by the resultant external force is zero

D. always

E. none of the above"

Answers (1)

umeri 09-03-2013
E. none of the above
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