Conceptual Physics (12th Edition)

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

Chapter 3 - Think and Discuss: 90

Answer

You would refer your friend to page 46, where free fall is defined as falling with no air resistance. To be fully correct your friend should not use the word "free". Instead, s/he should say “Air resistance is more effective in slowing a falling feather than in slowing a falling coin.”
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