Final answer:
A faster speed is indicated by a steeper incline, while a slower speed is indicated by a flatter slope.
Step-by-step explanation:
The slope in the context of a physics problem related to a car's motion generally refers to either the velocity of the car on a distance versus time graph or the acceleration of the car on a velocity versus time graph. In this specific scenario, based on the provided information, the correct interpretation is that the slope represents the car's velocity when discussing the slow car over the top of a curve.
For a car moving over a banked curve, as described in the example related to Figure 6.11, the slope of the road helps the car negotiate the curve.
The question is: "What does slope about the speed of the car? "