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11.  A person is
standing on a level floor. His head, upper torso, arms, and hands together
weigh 438 N and have a center of gravity that is 1.28 m above the floor. His
upper legs weigh 144 N and have a center of gravity that is 0.760 m above the
floor. Finally, his lower legs and feet together weigh 87 N and have a center
of gravity that is 0.250 m above the floor. Relative to the floor, find the
location of the center of gravity for his entire body.
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