試題詳解

4. A particle moves along the x axis. The net force on the particle, which is conservative, is given by F = (8 N/m³)x3. If the potential energy is taken to be zero for x = 0 then the potential energy as a function ofx is given by:
(A) (2 J/m⁴)x⁴
(B) (-2 J/m⁴)x⁴ 
(C) (24 J/m²)x⁴ 
(D) (-24 J/m²)x²
(E) (8 J/m²)x².