Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 10 - Reading Check Questions (Comprehension) - Page 201: 2

Answer

The vertical velocity component changes because gravity causes a vertical acceleration. The horizontal velocity component stays constant because there is no horizontal force (in the absence of air resistance).

Work Step by Step

This is discussed on page 183.
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