Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 11 - Test - Page 1180: 16


$-24$ feet /second in the downward direction

Work Step by Step

$ s(t)=-16t^2+72t $ Thus, we have $ v(t)=sā€²(t)=-16 \dfrac{dt^2}{dt}+72 \times \dfrac{dt}{dt}$ So, $ v(t)=-32t +72$ Set $ t=3$ Then $ v(3)=-32(3) +72=-24$ feet /second in the downward direction
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