A roller coaster goes over the top A of the track shown with a speed υ = 135 km/h. If the...

A roller coaster goes over the top A of the track shown with a speed υ = 135 km/h. If the radius of curvature at A is ρ = 60 m, determine the minimum force that a restraint must apply to a person with a mass of 85 kg to keep the person on his or her seat.

Figure P3.121