Difficult
$A$ particle moves along a circle of radius $r$ with constant tangential acceleration. If the velocity of the particle is $v$ at the end of the second revolution after the motion has started,then the tangential acceleration is
- A$\frac{v^2}{8 \pi r}$
- B$\frac{v^2}{6 \pi r}$
- C$\frac{v^2}{4 \pi r}$
- D$\frac{v^2}{10 \pi r}$
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