Determine the maximum speed at which the car with mass m can pass over the top point A of the vertical curved road and still maintain contact with the road.(Figure 1) Express your answer in terms of some or all of the variables m, r, and appropriate constants. If the car maintains this speed, what is the normal reaction the road exerts on the car when it passes the lowest point B on the road? Express your answer in terms of some or all of the variables m, r, and appropriate constants.