Video Problem #2, Lecture #9: You are driving up a steep mountain road. You stop at a stoplight just as he back wheel of your car falls off. It rolls back down a steep hill, past a herd of sheep, up a smaller hill next to a silo, and down another hill. Calculate the speed of the wheel just before it smashes into a Dairy Queen at the base of the mountain, an elevation 600 m below the stoplight. Assume the wheel has a mass of 30 kg, a radius of 40 cm and a moment of inertia of 1.2 kg-m², and neglect any air resistance or kinetic friction.