Derive an equation for angle of road banking.
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m= mass of the vehicle.
f = frictional force.
R = normal force.
μ = coefficient of the friction between road and vehicle.
α = angle of banking.
r = radius of the banked curved road.
v^2/rg = ( R sin α + μR cos α)/ ( R cos α - μR sin α)
angle of banking = α = tan^(-1) [(v^2 - μrg) / (rg + μv^2)]
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