The-sum-of-the-kinetic-and-potential-energies-of-a-system-of-objects-is-conserved-1-Only-when-no-external-force-acts-on-the-objects-2-Only-when-the-objects-move-along-closed-paths-3-Only-when-th

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Question Number 24685 by Tinkutara last updated on 24/Nov/17

$$\mathrm{The}\mathrm{sum}\mathrm{of}\mathrm{the}\mathrm{kinetic}\mathrm{and}\mathrm{potential}$$$$\mathrm{energies}\mathrm{of}\mathrm{a}\mathrm{system}\mathrm{of}\mathrm{objects}\mathrm{is}\mathrm{conserved}$$$$\left(1\right)\mathrm{Only}\mathrm{when}\mathrm{no}\mathrm{external}\mathrm{force}\mathrm{acts}\mathrm{on}$$$$\mathrm{the}\mathrm{objects}$$$$\left(2\right)\mathrm{Only}\mathrm{when}\mathrm{the}\mathrm{objects}\mathrm{move}\mathrm{along}$$$$\mathrm{closed}\mathrm{paths}$$$$\left(3\right)\mathrm{Only}\mathrm{when}\mathrm{the}\mathrm{work}\mathrm{done}\mathrm{by}\mathrm{the}$$$$\mathrm{resultant}\mathrm{external}\mathrm{force}\mathrm{is}\mathrm{zero}$$$$\left(4\right)\mathrm{None}\mathrm{of}\mathrm{these}$$

Commented by ajfour last updated on 25/Nov/17

$$\left(3\right).(?)$$

Commented by Tinkutara last updated on 25/Nov/17

$$\mathrm{No}.$$

Commented by ajfour last updated on 25/Nov/17

$$Anyexplanationtobackup?$$

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