A curved road of radius 78 m is banked for a designed speed of 85 km/h. If the coefficient of static friction is 0.30, at what range of speeds can a car safely make the curve?

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A curved road of radius 78 m is banked for a designed speed of 85 km/h. If the coefficient of static friction is 0.30, at what range of speeds can a car safely make the curve? [Hint: Consider the direction of the friction force when the car goes too slow or too fast]