JHamm

tell me if you can help me ! i need some formula for this problem !!
I thing is about Newton's laws ??

A curve of radius 30 m is banked at an angle θ. Find θ
For which a car can round the curve at 40km/h even if the road is frictionless.

In this case only two forces act on the car: gravity and the normal force. Since the road is banked, the normal force has a horizontal component , that supplies the needed centripetal force . In figure 5-32, the forces exerted by the road on the car are represented by Fn1 and Fn2. These forces are combined into Fn in the Figure 5-33. We find this angle by applying Newton’s second law. The total normal force has the component Fn sin θ directed toward the center of the curve, which provides the centripetal acceleration of the car.
can you help me JHamm this is for my exam in medicine , please