A stretch of highway includes a succession of evenly spaced dips and humps, the contour...

A stretch of highway includes a succession of evenly spaced dips and humps, the contour of which may be represented by the relation What is the maximum speed at which the car A can go over a hump and still maintain contact with the road? If the car maintains this critical speed, what is the total reaction N under its wheels at the bottom of a dip? The mass of the car is m.