1. The problem statement, all variables and given/known data A car is driven at a constant speed of 10.0 m/s as it travels over a circular-shaped arch. If the radius of curvature of the bridge is 50.0m, what upward force does the car exert on the 64.0 kg person riding in the car as it passes over the bridge? 2. Relevant equations v2/r=ac Fman on car=Fcar on man Fg=mag 3. The attempt at a solution The centripetal acceleration is towards the center, or down towards the bottom of the arched bridge. Similarly, the man's weight is exerted downwards. Both of these forces contribute to the Fman on car. Hence, Fman on car=mag+mv2/r, making the answer 755.84 N. However, the answer key says that the mag and the mv2/r are in different directions, making the answer 499.84 N instead. Any help on this would be greatly appreciated.