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4. The resultant ground reaction force was measured when a
person steps on a force plate. What are the vertical and
horizontal components of this ground reaction force?
7-1
100ON
1000N
80°
5. Use a trigonometric solution to find the magnitude of the
resultant of the following coplanar forces: 120 N at 30°, 80 N at
120°, and 100 N at 85°, All angles are relative to the positive X
axis. (Show you figure.)

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