The figure below shows a roller coaster car with a mass of 612 kg. At the top of the first hill of height h1=41 m the speed of the car is vo=7.5 m/s. The roller coaster track is frictionless except for at the end of the ride where there is an area where there is friction between the car and the track. In this region, the coefficient of kinetic friction between the track and the cart is 0.8. Determine: