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Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker
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CE Predict/Explain You drive your car in a straight line

Chapter 2, Problem 7P

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QUESTION:

Problem 7P

CE Predict/Explain You drive your car in a straight line at 15 m/s for 10 kilometers, then at 25 m/s for another 10 kilometers, (a) Is your average speed for the entire trip more than, less than, or equal to 20 m/s? (b) Choose the best explanation from among the following:

I. More time is spent at 15 m/s than at 25 m /s.

II. The average of 15 m/s and 25 m/s is 20 m/s.

III. Less time is spent at 15 m/s than at 25 m/s.

Questions & Answers

QUESTION:

Problem 7P

CE Predict/Explain You drive your car in a straight line at 15 m/s for 10 kilometers, then at 25 m/s for another 10 kilometers, (a) Is your average speed for the entire trip more than, less than, or equal to 20 m/s? (b) Choose the best explanation from among the following:

I. More time is spent at 15 m/s than at 25 m /s.

II. The average of 15 m/s and 25 m/s is 20 m/s.

III. Less time is spent at 15 m/s than at 25 m/s.

ANSWER:

Step 1 of 3:

The distance and average speed for the distance is given. Explain if the average speed will be less than, equal to or greater the specified value.

Then choose the correct explanation for the result.

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