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 211: 19

Answer

$2200J=2.2kJ$

Work Step by Step

According to the work-energy theorem, work is equal to the change in kinetic energy. Since the object is initially at rest, the change in kinetic energy is equal to the final kinetic energy. This means that $$W=\frac{1}{2}mv^2$$ Substituting known values of $m=73kg$ and $v=7.7m/s$ yields a work of $$W=\frac{1}{2}(73kg)(7.7m/s)^2=2,200 J=2.2kJ$$
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