Answer
$\theta=-180^{\circ}$
Work Step by Step
The minus sign indicates that it bounces back in the – x direction. The angle is $−180^{\circ}$.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 9 - Center of Mass and Linear Momentum - Problems - Page 254: 97f
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