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• Topic:

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If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be

(1) $mg+\frac{m{v}^{2}}{r}$

(2) $mg-\frac{m{v}^{2}}{r}$

(3) $\frac{{m}^{2}{v}^{2}g}{r}$

(4) $\frac{{v}^{2}g}{r}$