Center of Mass: A 3.0-kg mass is located at (0.0 m, 8.0 m), and a 1.0-kg mass is located at (12 m, 0.0 m). You want to add a 4.0-kg mass so that the center of mass (or center of gravity) of the three-mass system will be at the origin. What should be the coordinates of the 4.0-kg mass?
A. (-3.0 m, -6.0 m)
B. (-12 m, -8.0 m)
C. (3.0 m, 6.0 m)
D. (-6.0 m, -3.0 m)
Answer: A
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