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The forces acting on the car at the highest point of the bump are its weight downward and normal force up. There has to be a net force downward force to keep the car moving over the bump.
mass = 60 kg
speed = 10 m/s
force by the seat = Fseat
mv^2/R = N - mg
N = m(g + v^2/R) = (60)(9.8 + (10)^2/30)
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