Answer
$5$ seconds
Work Step by Step
We have $$-16t^2+400=0$$ $$-16t^2=-400$$ $$t^2=25$$ $$t=\sqrt {25} = 5$$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Review - Page 332: 141
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