Picture a car driving at 60 miles per hour, along a straight stretch of road, with a pebble stuck in the treads of one of the tires. There's a moment each time the tire goes around when the pebble is touching the pavement. From the perspective of someone standing on the sidewalk, how fast is the pebble moving at the moment when it is touching the pavement, and in what direction (see Figure 4)? A. Explain your answer. B. Give a different answer someone might believe and that per- Figure 4: How is the bottom of the tire moving? son's reasoning- C. Respond to the person in part b: Why doesn't that reasoning work