Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 7 - Work and Kinetic Energy - Problems and Conceptual Exercises - Page 213: 55

Answer

Positive.

Work Step by Step

According to the work-energy theorem, work is equal to the change in kinetic energy. Since the speed of the youngster increases, the kinetic energy increases. Since the kinetic energy increased, the work done by the force was positive.
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