Conceptual Physics (12th Edition)

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

Chapter 4 - Think and Discuss: 121

Answer

It is true that there is a brief net upward net force on Nellie during the short time that upward air resistance exceeds her weight. This causes an upward acceleration. However, she is already moving downward at high speed, so this upward acceleration only tends to decrease the rate at which her speed increases. It does not turn her velocity around to be upward.
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