Car A drives at speed v around a circular section of an unbanked road with a radius of curvature r. Car B drives at speed 2v around a different circular section of unbanked road with a radius of curvature 2r. The frictional force required to keep Car A on the road without skidding is F The frictional force required to keep Car B on the road without skidding is Explain your reasoning / show your work, a. F/4 b. F/2 c. F d. 2F e. 4F

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