Answer
See below.
Work Step by Step
$s=kt^2$, hence here $16=k\cdot1^2$, thus $k=16$
Thus after $t=3s$, $s=16\cdot3^2=144$
Hence $64=16t^2$, so $t=\pm2$, the negative value doesn't make sense, thus it takes $2$ seconds.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 2 - Section 2.5 - Variation - 2.5 Assess Your Understanding - Page 192: 25
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