When a vehicle of mass $m$ is moving with a velocity $v$ over a concave over-bridge of radius of curvature…
When a vehicle of mass $m$ is moving with a velocity $v$ over a concave over-bridge of radius of curvature $r$, the thrust on the road at the lowest point on the bridge will be
$m g+\frac{m v^2}{r}$
$m g-\frac{m v^2}{r}$
$\frac{m^2 v^2 g}{r}$
$\frac{v^2 g}{r}$
Solution
Let the mass of the vehicle be $m$ and velocity of the vehicle be $v$, the radius of curvature of over-bridge be $r$.
The centripetal force on the vehicle $=\frac{m v^2}{r}$
The thrust on the road at lowest point, $F_{\text {Net }}=$ weight of the vehicle + centripetal force
$
=m g+\frac{m v^2}{r}
$