A particle starting from rest, moves in a circle of radius ‘r’. It attains a velocity of ${\mathrm{V}}_0$ m/s in the ${\mathrm{n}}^{\mathrm{th}}$ round. Its angular acceleration will be,

• A

  $\frac{{\mathrm{V}}_0^2}{4\mathrm{\pi nr}}\mathrm{rad}/{\mathrm{s}}^2$

• B

  $\frac{{\mathrm{V}}_0}{\mathrm{n}}\mathrm{rad}/{\mathrm{s}}^2$

• C

  $\frac{{\mathrm{V}}_0^2}{2{\mathrm{\pi nr}}^2}\mathrm{rad}/{\mathrm{s}}^2$

• D

  $\frac{{\mathrm{V}}_0^2}{4{\mathrm{\pi nr}}^2}\mathrm{rad}/{\mathrm{s}}^2$