An RC car drives around in a circle of radius 1.00 m. The coefficient of static friction between the tires and the floor is 0.85; the coefficient of kinetic friction is 0.60. The mass of the car is 40 kg.

a) What is the maximum speed the car can have without skidding?
b) What is the minimum speed the car must have to keep moving in a circle?
c) What is the frictional force acting on the car when it is moving at 3.0 m/s?
d) What is the net force acting on the car when it is moving at 3.0 m/s?