Answer
$$64 \ lb\cdot ft.$$
Work Step by Step
The force needed is $4 \ lb$. Hence, the work is given by ($W=Fd$):
$$(4 \ lb)(16 \ ft)=64 \ lb\cdot ft.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 6 - Applications of the Integral - 6.5 Work and Energy - Exercises - Page 316: 2
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