4. A car skidded going into an intersection, struck a pedestrian, and continued until it hit a tree. Based on the damage to the front of the car, it is estimated that the car was doing 10 kph at impact with the tree. The length of the skid marks was measured at 42 m. The road is on a downhill grade -5 percent. A test car skidded 15.5 m on the same section of rod when braked from a speed of 45 kph to a halt a.) What is the coefficient of friction between the tires and the pavement ? b.) What is the probable speed of the car involved in the accident when the brakes were applied ? c.) If the perception reaction time of the driver is 1.5 seconds, what could have been its minimum total stopping distance to avoid the crash ?

4. A car skidded going into an intersection, struck a pedestrian, and continued until it hit a tree. Based on the damage to the front of the car, it is estimated that the car was doing 10 kph at impact with the tree. The length of the skid marks was measured at 42 m. The road is on a downhill grade -5 percent. A test car skidded 15.5 m on the same section of rod when braked from a speed of 45 kph to a halt a.) What is the coefficient of friction between the tires and the pavement ? b.) What is the probable speed of the car involved in the accident when the brakes were applied ? c.) If the perception reaction time of the driver is 1.5 seconds, what could have been its minimum total stopping distance to avoid the crash ?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A vehicle hit a big tree near the edge of highway pavement. Based on the conditions of damages on the vehicle, the estimated speed when the vehicle hit the tree was 20 mile/hr. The observed skid mark on the pavement was 350 ft. The grade of the highway is 3% downward and F=0.35. What is the initial speed of the vehicle right before the driver pushed the brake ?
Add figure if necessary.
The length of a highway is 550 m when a head-on vehicle collision occurred. Police reports show that neither human error nor vehicle malfunction was the cause of the collision. Check if the length of the highway is sufficient for an overtaking maneuver. *Accident Report: Speed of Overtaking Car = 96 kph, Speed of Overtaken Car = 88 kph, Perception-reaction Time = 2.5 sec, Average acceleration = 2.4 m/sec2, Time of the passing vehicle occupying the left lane = 10.4 sec, Distance between the passing vehicle at the end of its maneuver and the opposing vehicle = 84m.
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A car is traveling at a speed of 100 ft/s which accelerates 12 ft/s2. The perception reaction time for the driver is 2.40 s. If the maximum grade of the road is -3.7%, compute the following: a. Braking distance in meters b. Lag distance in meters
An accident investigator estimates that a vehicle hit an advertisement column at a speed of 30 mi/h, based on his assessment of damage. Leading up to the accident location, he observes skid marks of 100 ft on the pavement (F = 0.35), 10 ft on the shoulder (F=0.3), and 75 ft on the grass shoulder (F = 0.25); the grades of the pavement, the shoulder and the grass are 2%, 8% and 6% downgrade, respectively. If the post speed of this highway is 60 mi/h, does the initial speed of the driver is one of the accident cause? i need solutions in 10 minutes please
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