The roller-coaster car at A has a speed of (15 m/s) when it is at the crest of a vertical parabolic track. Determine the car’s velocity and the normal force it exerts on the track when it reaches point B, also determine the height h of the hill C so that the car travels around inside the loops without leaving the track. Neglect friction and the mass of the wheels. The total weight of the car and the passengers is 500 kg, take rhoC=50ft.