An automobile is driven at 30 mph for 12 min, then at 40 mph for 20 min, and finally 50 mph for 8min. What is the average speed over this interval? How fast must the automobile move in the last 8 min to obtain an average speed of 35 mph?

An automobile is driven at 30 mph for 12 min, then at 40 mph for 20 min, and finally 50 mph for 8min. What is the average speed over this interval? How fast must the automobile move in the last 8 min to obtain an average speed of 35 mph?

An Introduction to Physical Science

14th Edition

ISBN:9781305079137

Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Chapter2: Motion

Section: Chapter Questions

Problem 1AYK: Do highway speed limit signs refer to average speeds or to instantaneous speeds? Explain.

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Distance and Speed

The speed, distance and time relation forms the basis of study of motion. You will need these concepts in the study of Mechanics. This concept is applicable for students who are studying the following courses –

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An automobile is driven at 30 mph for 12 min, then at 40 mph for 20 min, and finally 50 mph for
8min. What is the average speed over this interval? How fast must the automobile move in the last 8 min to obtain an average speed of 35 mph?

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