John is driving with his date, Rachel. They are late for the movie because he and Rachel decided enjoying some adult beverages after their dinner. To make up the time, John decides to drive 5 mph over the speed limit (speed limit = 75mph). He is driving only 5 mph over speed limit (instead of the 10 mph over speed limit that some drivers do). While driving, he takes his eyes off the road to look dreamingly into Rachel’s blue eyes. Since she is the love of his life, it is a long glance. When he looks back at the road, he sees a truck 850 ft in front of him blocking the road. He slams on the brakes. The combination of alcohol, reduced visibility (due to the rain), and distraction causes his reaction time to be 20 percent slower than the standard perception/reaction time. Because it is raining, the wet pavement friction factor is also assumed to be 25 percent less than standard for SSD. The road is level at this location (G=0).(1) What is John’s deceleration rate? (2) What is John’s reaction time? (3) What is the distance required for John to stop the car (total stopping distance)? (4) Does John’s car hit the truck? (5) If he hits the truck, calculate the speed that john’s vehicle was traveling at impact. (6)Would he have hit the truck if his reaction time was not affected by alcohol, Rachel’s beauty, and visibility, and surface was dry and he had been driving the speed limit?
John is driving with his date, Rachel. They are late for the movie because he and
Rachel decided enjoying some adult beverages after their dinner. To make up the time, John decides to
drive 5 mph over the speed limit (speed limit = 75mph). He is driving only 5 mph over speed limit (instead
of the 10 mph over speed limit that some drivers do). While driving, he takes his eyes off the road to look
dreamingly into Rachel’s blue eyes. Since she is the love of his life, it is a long glance. When he looks back
at the road, he sees a truck 850 ft in front of him blocking the road. He slams on the brakes. The
combination of alcohol, reduced visibility (due to the rain), and distraction causes his reaction time to be 20
percent slower than the standard perception/reaction time. Because it is raining, the wet pavement friction
factor is also assumed to be 25 percent less than standard for SSD. The road is level at this location (G=0).(1) What is John’s deceleration rate?
(2) What is John’s reaction time?
(3) What is the distance required for John to stop the car (total stopping distance)?
(4) Does John’s car hit the truck?
(5) If he hits the truck, calculate the speed that john’s vehicle was traveling at impact.
(6)Would he have hit the truck if his reaction time was not affected by alcohol, Rachel’s beauty, and
visibility, and surface was dry and he had been driving the speed limit?
Step by step
Solved in 8 steps with 7 images
