2. If the coefficient of friction between vehicles and the road is 0.4 and the radius of curvature of
a circular curve of the road is 30 m. What is the maximum speed allowable if there is no
banking?
Fa=Ffr,F_a=F_{fr},Fa=Ffr,
mv2r=μmg,\frac{mv^2}r=\mu mg,rmv2=μmg,
v=μgr=10.8 ms.v=\sqrt{\mu gr}=10.8~\frac ms.v=μgr=10.8 sm.
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