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A car goes on a horizontal circular road...

A car goes on a horizontal circular road of radius R. The speed of car is increasing at constant rate a m/`s^2`. If the friction coefficient between the road and the tyre is `mu`, then the limiting speed of car is

A

A. `[(mu^2g^2-a^2)R^2]^(1/4)`

B

B. `[(mu^2g^2+a^2)R^2]^(1/4)`

C

C. `sqrt (mu g R)`

D

D. `sqrt (a R)`

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