Question

Lauren was driving in her neighborhood and approached a stop sign. When she applied the brakes, it took 4.5 seconds to come to a complete stop from a speed of 20 miles per hour. If Lauren creates a graph of her speed versus time as she applies the brakes, which of the following would describe the domain for her graph?

Answer 1

Explanation:

Assuming Lauren's speed started at 20 miles per hour , and decreased linearly to zero in a straight line as she applied the brakes, the domain of her graph would be the range of time it takes her to come to a complete stop. In this case, it is 0 seconds to 4.5 seconds.

So the domain of her graph would be [0, 4.5] seconds.

It's worth noting that without more information about the specifics of the braking process, such as the exact shape of the deceleration curve, this is an approximation.

Answer 2

The domain of the graph would be the time it took Lauren to come to a complete stop, which is 4.5 seconds. So the domain would be [0, 4.5] seconds.