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College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs
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A student drove to the university from her home and noted

Chapter 2, Problem 11

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QUESTION:

Problem 11PE

A student drove to the university from her home and noted that the odometer reading of her car increased by 12.0 km. The trip took 18.0 min. (a) What was her average speed? (b) If the straight-line distance from her home to the university is 10.3 km in a direction 25.0º south of east, what was her average velocity? (c) If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity for the entire trip?

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QUESTION:

Problem 11PE

A student drove to the university from her home and noted that the odometer reading of her car increased by 12.0 km. The trip took 18.0 min. (a) What was her average speed? (b) If the straight-line distance from her home to the university is 10.3 km in a direction 25.0º south of east, what was her average velocity? (c) If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity for the entire trip?

ANSWER:

Part (a)

Step 1 of 7:

An odometer is a device that is used to calculate the speed of a vehicle. The ratio of the total distance traveled during the trip and the time taken is called as average speed. We are going to calculate the average speed of the student during her trip to the university.

The increase in the odometer reading x = 12.0 km

The time taken by the student to reach the University from her home t = 18.0 min

To find the average speed of the trip. Consider all our quantities are in 3 significant figures.

The average speed =

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