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Question

An Fx graph is shown below. Find the difference in initial and final potential energies from x=0 m to x=3 m.


A
5 J
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B
10 J
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C
15 J
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D
20 J
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Solution

The correct option is C 15 J
Change in potential energy is the negative of the work done by the internal conservative force.
ΔU=UfUi=fiF.dr
= Area under (Fx) curve
=5×3=15 J

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