A ball of mass 200 g moving with a velocity of 8 m/s collides and sticks with another ball of mass 300 g moving in the same direction with velocity 4 m/s. What is the common velocity of the balls after the collision?

• A.5.6 m/s
• B.2.8 m/s
• C.11.2 m/s
• D.1.4 m/s