17. 30 Car 1 20 Position (m) 10- 0 Car 2 -10 0 0.5 1.0 Time (s) Two identical cars, car 1 and car 2, are moving in opposite directions on a straight road. The position of each car as a function of time is represented in the graph. What is the speed of the center of mass of the two-car system? (A) Zero (B) 10 m/s (C) 20 m/s (D) 40 m/s
