During Hockey Practice, Two Pucks Are Sliding Across the Ice

Multiple Choice

During hockey practice, two pucks are sliding across the ice in the same direction. At one instant, a 0.18-kg puck is moving at 16 m/s while the other puck has a mass of 0.14 kg and a speed of 3.8 m/s. What is the velocity of the center of mass of the two pucks?

A) 5.0 m/s
B) 7.0 m/s
C) 9.0 m/s
D) 11 m/s
E) 13 m/s