Concept explainers
You travel from point A to point B in a car moving at a constant speed of 70 km/h. Then you travel the same distance from point B to another point C, moving at a constant speed of 90 km/h. Is your average speed for the entire trip from A to C equal to 80 km/h? Explain why or why not.
Whether the average speed for the entire trip is
Answer to Problem 15Q
Solution:
No
Explanation of Solution
Given:
The distance from A to B and B to C is same.
The speed of the car from point A to B is
The speed of the car from point B to C is
Formula Used:
Calculation:
If the distance from A to B and B to C is same, let it be x km than total distance is equal to 2x km.
Time to cover distance from A to B
Time to coverdistance from B to C
Total time
Conclusion:
Thus, the average speed is found to be less than 80 km/hr that is 78.75 km/hr.
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Physics: Principles with Applications
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