Q 1415312269.     A particle moves along a circle of radius `( 20/pi)` m with constant tangential acceleration. If the speed of the particle is `80 m/s` at the end of the second revolution after motion has begun, the tangential acceleration is

A

`160 pi m/s^2`

B

`40 pi m/s^2`

C

`80 m/(s^2)`

D

`640 pi m/s^2`

HINT

`v = sqrt(2ad)`

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