On a Curved Roadway of Radius 100 M,the Suggested Speed

Multiple Choice

On a curved roadway of radius 100 m,the suggested speed limit is 35 mph (approximately 16 m/s) .What must the coefficient of friction be between a car's tires and the road for the car to safely negotiate the curve at the posted speed?

A) 0.72
B) 0.51
C) 0.26
D) 0.40
E) 0.13