A 1.0kg motorized car is moving at 2.4m/s at the top of a 2.0m high hill. The hillside is concave and the total distance to the bottom along the hillside is 4.5m. The car has a motor capable of producing 5.0W of motive power and the wheels produce an average force of friction of 2.0N. If it takes 0.5s for the car to get to the bottom of the hill, how fast is the car going when it reaches the bottom?