Question
A road of width 20 m forms an arc of radius 15 m, its outer edge is 2 m higher than its inner edge. Calculate for what velocity the road is banked.
Answer: Option B
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Condition for velocity on banked road
`because tan theta = v^2/rg`
`:.` ` v = sqrt(rg tan theta)`
But tan` theta = theta = sin theta = 2/20` ( for small angle)
`:.` `v = sqrt(15 xx 9.8 xx 2/20)`
= `sqrt(14.7)` m/s
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