If the stopping distance at 30 mph is D, the stopping distance at 60 mph is how many times D?

Prepare for the Wisconsin Law Enforcement Standards Board (LESB) Phase 2 Exam. Engage with flashcards and multiple choice questions, with insightful hints and explanations. Ace your exam!

Multiple Choice

If the stopping distance at 30 mph is D, the stopping distance at 60 mph is how many times D?

Explanation:
Stopping distance increases with the square of speed. Doubling the speed from 30 mph to 60 mph makes the stopping distance four times larger, because (2)^2 = 4. So if the distance at 30 mph is D, the stopping distance at 60 mph becomes 4D. This relies on keeping road, tire, and braking conditions the same and using a constant driver reaction time, with braking distance being the main factor at higher speeds.

Stopping distance increases with the square of speed. Doubling the speed from 30 mph to 60 mph makes the stopping distance four times larger, because (2)^2 = 4. So if the distance at 30 mph is D, the stopping distance at 60 mph becomes 4D. This relies on keeping road, tire, and braking conditions the same and using a constant driver reaction time, with braking distance being the main factor at higher speeds.

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