If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be
  • A$mg + \frac{{m{v^2}}}{r}$
  • B$mg - \frac{{m{v^2}}}{r}$
  • C$\frac{{{m^2}{v^2}g}}{r}$
  • D$\frac{{{v^2}g}}{r}$
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