Answer :
Final answer:
The question asks about the total stopping distance at 20 mph, which includes both reaction time and braking distance. Standard calculations usually provide these distances, but the exact values cannot be confidently determined without additional data or empirical tables that are not provided in the question or referenced materials.
Explanation:
The student has asked how long it would take to stop a vehicle with good brakes from 20 miles per hour under good conditions. The correct answer is not provided directly in the given question, but we can deduce it from the general principles of stopping distances. Stopping distance is made up of reaction distance and braking distance. Reaction distance refers to the distance covered from the moment the driver perceives a hazard until the brakes are applied. This is generally influenced by the driver's reaction time. Braking distance is the distance needed by the vehicle to come to a complete stop once the brakes have been applied.
Based on standard reaction times and braking efficiency, for a vehicle traveling at 20 mph, a typical reaction distance (assuming an average reaction time of 1.5 seconds) plus braking distance would be much less than the options given. However, without specific information to calculate the exact distance, we cannot confidently provide the correct answer from the options listed (A, B, C, or D).
