A child builds a simple cart consisting of a 0.60 m by 1.20 m sheet of plywood of mass 8.5 kg and four wheels, each 20.0 cm in diameter and with a mass of 1.98 kg. It is released from the top of a 15° incline that is 32 m long. Find the speed at the bottom. Assume that the wheels roll along the incline without slipping and that friction between the wheels and their axles can be neglected. (You may assume that the center of mass of the cart starts at very top of the incline.)