A particle moves along a circle of radius $\left(\frac{20}{\mathrm{π}}\right)\mathrm{m}$ with constant tangential acceleration. It the velocity of the particle is 80 m/s at the end of the second revolution after motion has begun, the tangential acceleration is

• A

  $640\mathrm{π}\mathrm{m}/{\mathrm{s}}^2$

• B

  $160\mathrm{π}\mathrm{m}/{\mathrm{s}}^2$

• C

  $40\mathrm{π}\mathrm{m}/{\mathrm{s}}^2$

• D

  $40\mathrm{m}/{\mathrm{s}}^2$