62) The roadway bridege over a canal is in the form of an arc of circle of radius20m. What is the maximum speed with which a car can cross the bridge without leaving contact with it at the highest point? Given, g=9.8m s-2 .

At the highest point of the bridge for critical condition ,mg-mv2r=0or mg=mv2rv=rg=9.8×20=196=14 m/s

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