For a system of conservative forces,the potential energy is given by the formula $U = ax^2 - bx$,where $a$ and $b$ are constants. The equilibrium position and the equilibrium potential energy will be,respectively:
- A$\frac{b}{2a}, -\frac{b}{2a}$
- B$\frac{b}{2a}, -\frac{b^2}{4a}$
- C$\frac{b^2}{2a}, -\frac{b^2}{2a}$
- D$-\frac{b}{4a}, -\frac{b}{4a}$
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