Answer
$x_{cog} = 0.987~m$
Work Step by Step
We can find $x_{cog}$:
$x_{cog} = \frac{\sum g_i~x_i}{\sum g_i}$
$x_{cog} = \frac{(7.40)(2.00~m)+(7.60)(2.00~m)+(7.80)(2.00~m)}{8.00+7.80+7.60+7.40+7.60+7.80}$
$x_{cog} = 0.987~m$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 12 - Equilibrium and Elasticity - Problems - Page 345: 1c
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