In a "Rotor-ride" at a carnival, people rotate horizontally around the center of a cylindrical "room". If the room radius is 4.5 m, and the velocity of a 40 kg child making contact with the wall is 10 m/s, what is the normal force of the wall on the child? (b) If the coefficient of static friction between the child's back and wall is 0.25, what is the force of friction on the child? (c) Is this a safe ride for the child, assuming the platform below will swing open during the ride? If not, what would make the ride safer?