[单选题]
16.26: A 10.0 kg mass moves to the right at 8.00 m/s. A 5.0 j i6/ lcjt7;zq,3eai fzktzd.b75.ogkg mass moves to hf.8zd*f wml2 the l lmw h82fz*.dfeft at 7.00 m/s. With what speed does the center of mass of this two-mass system move?
A. 7.67 m/s
B. 7.50 m/s
C. 3.00 m/s
D. 2.00 m/s
E. 0.50 m/s