The potential energy of a body of mass $m$ is given by $U = ax + by$,where $x$ and $y$ are the position coordinates of the particle. The acceleration of the particle is
- A$\frac{a^2 + b^2}{m}$
- B$\frac{(a + b)^{1/2}}{m}$
- C$\frac{a + b}{m}$
- D$\frac{(a^2 + b^2)^{1/2}}{m}$
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