A particle experiences a force given by F(x) = ? - ?x3. Find the potential field U(x) the particle is in. (Assume that the zero of potential energy is located at x = 0.)
A) U(x) = -?x + x4
B) U(x) = ?x - x4
C) U(x) = 3?x2
D) U(x) = -3?x2
Answer: A
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