If the kinetic energy $(KE)$ of a particle of mass $m$ performing uniform circular motion $(UCM)$ in a circle of radius $r$ is $E$,find the acceleration of the particle.
- A$\frac{2 E}{m r}$
- B$\left(\frac{2 E}{m r}\right)^{2}$
- C$2 E m r$
- D$\frac{4 E}{m r}$
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