i need help

In a carnival ride, passengers stand with their backs against the wall of a cylinder. The cylinder is set into rotation and the floor is lowered away from the passengers, but they remain stuck against the wall of the cylinder. For a cylinder with a 2.0-m radius, what is the minimum speed that the passengers can have so they do not fall if the coefficient of static friction between the passengers and the wall is 0.25? f'\\ ' 4.9 m/s 3.0 m/s 0 2.3 m/s f" ' 8.9 m/s n' It depends on the mass of the passengers