A potential energy function is given by U(x) = ( 3.00 N/m)x - ( 1.00 N/m3)x3. At what position or positions is the force equal to zero?
A) m and - m
B) 0.00 m, m and - m
C) 1.00 m and -1.00 m
D) 3.00 m and -3.00 m
E) The force is not zero at any location.
Answer: C
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