Answer
$\frac{15}{4}$(ft-lb)
Work Step by Step
$f(x) = kx$
$x = \frac{4}{12}$,
$f(\frac{4}{12})=10$
$k=30$
$f(x)=30x$
$W =$
$1/2$
$ \int30x dx$
$0$
$=15(1/2)^{2}$
$= \frac{15}{4}$(ft-lb)
Calculus: Early Transcendentals 8th Edition
by Stewart, James
Published by
Cengage Learning
ISBN 10:
1285741552
ISBN 13:
978-1-28574-155-0
Chapter 6 - Section 6.4 - Work - 6.4 Exercises - Page 459: 7
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