The railway bridge over a canal is in the from of an arc of a circle of radius `20m` What is the minimum speed with which a car can cross the bridge without eving contact with the ground at the highest point Take ` g = 9.8ms^(-2)` .

Answer

` 14m//s` .

Explanation

Here, `r =20 m, upsilon = ? g = 9.8ms^(-2)`
The car will not leave contact with the ground if
`(m upsilon^(2))/(r) = mg, upsilon = sqrt(rg) = sqrt(20 xx9.8) =14m//s` .