At a certain point in time, the total energy of a closed system isobserved to be

Question

At a certain point in time, the total energy of a closed system isobserved to be 52 J. Which one of thefollowing statements is true? Eleven hours later the energy of thesystem is 26 J. Eleven hours later the energy of thesystem is 52J.     Allof the energy must be kinetic if the objects are moving.Eleven hours later the energy of thesystem is 104 J. Someof the energy must be potential. Eleven hours later the energy of thesystem is 26 J. Eleven hours later the energy of thesystem is 52J.     Allof the energy must be kinetic if the objects are moving.Eleven hours later the energy of thesystem is 104 J. Someof the energy must be potential. Eleven hours later the energy of thesystem is 26 J. Eleven hours later the energy of thesystem is 52J.     Allof the energy must be kinetic if the objects are moving.Eleven hours later the energy of thesystem is 104 J. Someof the energy must be potential.

Explanation / Answer

We know that the total energy of the closed system isconstant. Therefore we have                          Eleven hours later the energyof the system is 52 J.

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