A person takes a trip, driving with a constant speed of 89.5...

Name: Problem 13, Chapter 2: College Physics
Uploaded: 2019-11-09T15:55:09-08:00
Duration: 2 min 46 s
Channel: Averell Hause
Description: A person takes a trip, driving with a constant speed of 89.5 km/h, except for a 22.0-min rest stop. If the person’s average speed is 77.8 km/h, (a) how much time is spent on the trip and (b) how far does the person travel?

A person takes a trip, driving with a constant speed of 89.5 km/h, except for a 22.0-min rest stop. If the person’s average speed is 77.8 km/h, (a) how much time is spent on the trip and (b) how far does the person travel?

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Key Concepts

Average Speed

Average speed is the total distance traveled divided by the total time taken for the trip, including any stops. It reflects the overall efficiency of the trip rather than just the speed during motion.

Constant Speed (Uniform Motion)

Constant speed, or uniform motion, refers to traveling at a steady speed over a period of time. This concept simplifies calculations because the speed remains unchanged during the moving phases, allowing straightforward use of the distance equals speed multiplied by time formula.

Time-Distance Relationship

The time-distance relationship is a fundamental concept in physics that relates the three variables: distance, speed, and time. It is typically expressed as distance = speed × time, and it is essential for solving problems where one of these quantities must be determined.

Inclusion of Breaks in Travel Time

Including break times in travel calculations affects the overall average speed. Even if the moving speed is constant, stops and rest periods increase the total time, thereby reducing the computed average speed of the journey.

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