Teen Hoodlum in his souped-up jalopy is traveling along a deep dip in the road. Suppose Hoodlum weighs 170 lb (as measured when standing at rest on a spring scale). When he passes through the lowest point of the circular-shaped dip, with an effective radius of 50 m, the seat must exert an upward supporting force of 250 lb on him. What is his speed at that point