Conceptual Physics (12th Edition)

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

Chapter 10 - Think and Discuss: 100

Answer

Use the relationship between work and energy, $Fd = \delta KE$. For a constant thrust F of fixed duration, the maximum work done occurs when d is maximum. This will give the largest change in KE. For the time interval during which the rocket fires, the rocket will travel the farthest when it is moving fastest, which occurs at the perigee. This is discussed on page 198.
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