A vehicle is moving with a velocity $v$  on a curved road of width $b$  and radius of curvature $R.$  For counteracting the centrifugal force on the vehicle, the difference in elevation required in between the outer and inner edges of the road is
  • A$v^2b / Rg$
  • B$vb / Rg$
  • C$vb^2 / Rg$
  • D$vb / R^2g$
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