[填空题]
If a curve with a radius ofbdvpwc93 on 45 88 m up976rm6xe3osx z .tnis perfectly banked for a car traveling 75 $\mathrm{~km} / \mathrm{h}$ , what must be the coefficient of static friction for a car not to skid when traveling at 95 $\mathrm{~km} / \mathrm{h}$ ?