Three identical cars A, B and C are moving at the same speed on three bridges. The car A goes on a plane bridge, B on a bridge convex upward and C goes on a bridge concave upward. Let FA, FB and FC, be the normal forces exerted by the cars on the bridges when they are at the middle of bridges.
(a) FA is maximum of the three forces.
(b) FB is maximum of the three forces.
(c) Fc is maximum of the three forces.
(d) FA= FB= FC