Final answer:
The average passenger car can stop at approximately 130 to 140 feet when traveling at 55 mph, considering both reaction time and braking distance, with variations due to road conditions and braking systems.
Step-by-step explanation:
The average passenger car traveling at 55 miles per hour (55 mph) can stop in about 130 to 140 feet. This stopping distance accounts for both the driver's reaction time and the braking distance of the vehicle. However, the exact stopping distance can vary greatly depending on factors such as road conditions and the car's braking system. For instance, wet pavement can significantly increase the distance required for a car to come to a complete stop. Similarly, individual driver reaction time—often assumed to be around 0.500 seconds—can also affect this distance. It's crucial to remember that braking distance increases exponentially with speed, meaning that the faster you drive, the longer it will take to stop. When driving, always maintain a safe speed and distance from other vehicles to ensure that there's enough room to stop safely in an emergency.