In order to drive a car around a curve, there must be a frictional force between the tires and…

In order to drive a car around a curve, there must be a frictional force between the tires and the road, or the road must be banked. Consider a 1250 kg car traveling at a speed of 25.0 m/s around a curve with a radius of 175 m. If the curve is banked and the road surface is frictionless, what must be the angle (with respect to the horizontal) of the road surface?