An F−x graph is shown below. Find the difference in initial and final potential energies from x=0m to x=3m.
A
5J
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B
10J
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C
15J
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D
20J
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Solution
The correct option is C15J Change in potential energy is the negative of the work done by the internal conservative force. ΔU=Uf−Ui=−f∫i→F.→dr = Area under (F−x) curve =5×3=15J