At what angle should a circular road be banked so that a car running at 50km/hr be safe to go round the circular turn of 200m radius?

Given,
Speed of car (v)=50km/hr=13.89m/s
Radius of circle (r)=200m
Banking angle (θ)=?

We know,
tanθ= v2rg
tanθ= (13.89)220010 =0.0964
θ=5.5
⇒ Banking angle θ=5.5

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