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If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be
\( \mathrm{P} \)
(1) \( m g+\frac{m v^{2}}{r} \)
(2) \( m g-\frac{m v^{2}}{r} \)
W.
(3) \( \frac{m^{2} v^{2} g}{r} \)
(4) \( \frac{v^{2} g}{r} \)
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