13.

[0/2.85 Points]DETAILSPREVIOUS ANSWERSOSCOLPHYS2016 6.3.P.030.

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If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from sliding toward the inside of the curve (a real problem on icy mountain roads).

(a)

Calculate the ideal speed in (m/s) to take a115m radius curve banked at15.

m/s

(b)

What is the minimum coefficient of friction needed for a frightened driver to take the same curve at20.0km/h?