Answer
$t=2s$
Work Step by Step
For the maximum positive velocity, acceleration should be zero:
$a=24-12t=0$
$t=\frac{24}{12}=2s$
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 2 - Motion Along a Straight Line - Problems - Page 33: 18g
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