$A$ lorry is moving on a smooth circular path of radius $50 \ m$ with a velocity of $20 \ ms^{-1}$. Then the banking angle of the road is (Acceleration due to gravity $= 10 \ ms^{-2}$)
- A$\tan^{-1} \frac{5}{4}$
- B$\tan^{-1} \frac{4}{5}$
- C$\tan^{-1} \frac{2}{5}$
- D$\tan^{-1} \frac{5}{2}$
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