The velocity $v$ of a particle as a function of its position $(x)$ is expressed as $v=\sqrt{c_1-c_2 x}$, where $c_1$ and $c_2$ are positive constants. The acceleration of the particle is
- A$c_2$
- B$-\frac{c_2}{2}$
- C$c_1-c_2$
- D$\frac{c_1+c_2}{2}$
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- [AIPMT 1988]