Answer
$+6~m/s$, west.
Work Step by Step
Let west be the positive direction:
$v_{0}=12~m/s$ and $v_{f}=0$
$v_{av}=\frac{1}{2}(v_{f}+v_{i})=\frac{1}{2}(0+12~m/s)=+6~m/s$
+ means west.
Physics Technology Update (4th Edition)
by Walker, James S.
Published by
Pearson
ISBN 10:
0-32190-308-0
ISBN 13:
978-0-32190-308-2
Chapter 2 - One-Dimensional Kinematics - Problems and Conceptual Exercises - Page 50: 44
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