Concept explainers
(a)
The distance of home town from school.
(a)
Answer to Problem 7P
The distance is S = 258.05 km.
Explanation of Solution
Given:
The car runs at a speed of 95 km/h for a distance of 130 km.
For the remaining distance, the speed of the car is 65 km/h. And the total time of the journey is 3 hours 20 min.
Formula used:
Speed (v) , time (t) and distance s is related as,
Calculation:
Time required to travel the distance 130 km, is
Also, total time is
So the remaining time is
During this time, car travelled with a speed of
So, the distance travelled at time
The total distance is
Conclusion:
Therefore, the distance of home town from school is S = 258.05 km
(b)
The average speed of the car.
(b)
Answer to Problem 7P
The average speed of the car is 77.26 km/h.
Explanation of Solution
Given:
The car runs at a speed of 95 km/h for a distance of 130 km. For the remaining distance, the speed of the car is 65 km/h. And the total time of the journey is 3 hours 20 min.
Formula used:
Average speed of the car is the total distance travelled by the car divided by the total time for its whole journey.
Calculation:
Here total time is
So average speed is
Conclusion:
Therefore, average speed of the car is 77.26 km/h.
Chapter 2 Solutions
Physics: Principles with Applications
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