Three particles are placed in the xy plane. A 40-g particle is located at (3, 4) m, and a 50-g particle is positioned at (?2, ?6) m. Where must a 20-g particle be placed so that the center of mass of this three-particle system is located at the origin?
A. (?1, ?3) m
B. (?1, 2) m
C. (?1, 12) m
D. (?1, 7) m
E. (?1, 3) m
Answer: D
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