Answer
After 5 seconds
Work Step by Step
$s(t)=-1.8t+9$
It reaches the ground when $s(t)=0$
$0=-1.8t+9$
$1.8t=9$
$t=5$
The paper will reach the ground after 5 seconds
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 1 - Section 1.3 - Linear Functions and Models - Exercises - Page 92: 94c
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