[单选题]
The center of mass of a two-particle system is at the or.+wr7wmsfzjm r ( h9n)igin.y1+ x-topx4kr -pvt h8 One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the second mass of 3xh8+-x -p4rot ty1vpk .0 kg?
A. (-3.0 m, 0)
B. (-2.0 m, 0)
C. (2.0 m, 0)
D. (3.0 m, 0)
