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A motor car is travelling 20 m//s on a c...

A motor car is travelling 20 `m//s` on a circular road of radius 400 m. If it increases its speed at the rate of `1 m//s^2`, then its acceleration will be

A

`2 sqrt2 m//s^2`

B

`sqrt3 m//s^2`

C

`sqrt2 m//s^2`

D

`3sqrt3 m//s^2`

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