A 1,8000-kg SUV rounds a flay (unbanked) curve with a radius of 90m. the average coefficients of kinetic and static friction between the tire of the car and the road are static coefficient = 0.85 and kinetic coefficient = 0.65 respectively.
(a) What is the net force (magnitude and direction) acting on the car when it is driving at 21.0 m/s?
(b) What is the maximun driving speed for the car?
(c) Which friction (static or kinetic) provides the centripetal force needed for the car to stay in the curve and is the maximum driving speed depending on the mass of the SUV?