University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 2 - Motion Along a Straight Line - Problems - Discussion Questions - Page 57: Q2.1


The speedometer of any vehicle measures speed, not velocity.

Work Step by Step

Speed is the ratio of distance moved by a body in unit time irrespective of direction but velocity the ratio of distance moved by a body in unit time in a specific direction. Speed of a vehicle in a particular instant of time is called instantaneous speed. The ratio of total distance moved by a vehicle to the time taken by the vehicle is called the average speed. Speedometer measures the instantaneous speed but not average speed.
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