A curve with a radius of 50 m is banked at an angle of 25°. The coefficient of static friction between the tires and the roadway is 0.3.
a. Find the correct speed of an automobile that does not require any friction force to prevent skidding.
b. What is the maximum speed the automobile can have before sliding up the banking?
c. What is the minimum speed the automobile can have before sliding down the banking?