I was able to find the ideal speed for part a, I need help finding the minimum coefficient in part b.

(a) Calculate the ideal speed to take a 80 m radius curve banked at 15°.  V2=(80 m)(9.8 m/s2)(sin 15)V2=(784 s)(0.25)V2=196V=Sq Rt.196V=14 m/s(b) What is the minimum coefficient of friction needed for a frightened driver to take the same curve at 30.0 km/h?  

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