$A$ particle of mass $m$ moves along a circle of radius $r$ with constant tangential acceleration. If the kinetic energy $(K.E.)$ of the particle is $E$ by the end of the third revolution after the beginning of the motion,then the magnitude of the tangential acceleration is:
- A$\frac{E}{2 \pi rm}$
- B$\frac{E}{6 \pi rm}$
- C$\frac{E}{8 \pi rm}$
- D$\frac{E}{4 \pi rm}$
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