The Sum of the Kinetic and Potential Energies of a System

question 52

Multiple Choice

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

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