
Concept explainers
(a)
The distance traveled by the vehicle when the acceleration is 45 ft/sec.

Answer to Problem 9P
Explanation of Solution
Given information:
Initial vehicle speed,
Final vehicle speed,
Concept used:
The time required by the vehicle upon acceleration is calculated by using the relation,
The distance travelled at any time is calculated by using the formula,
Calculation:
The time taken by the vehicle is calculated as,
Conclusion:
The distance traveled when the vehicle has accelerated to 45 ft/sec is
(b)
The time taken by the vehicle to attain a speed of 45 ft/sec.

Answer to Problem 9P
Explanation of Solution
Given information:
Initial vehicle speed,
Final vehicle speed,
Concept used:
The time required by the vehicle after accelerated is calculated by using the relation,
Calculation:
Conclusion:
The time for vehicle to attain speed of 45 ft/sec is
(c)
The acceleration of the vehicle after 4 seconds.

Answer to Problem 9P
Explanation of Solution
Given information:
Initial vehicle speed,
Final vehicle speed,
Time taken,
Concept used:
The initial velocity is calculated and then the acceleration is calculated.
Calculation:
Conclusion:
The acceleration after 4 seconds is
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Chapter 3 Solutions
Traffic and Highway Engineering
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