Curious George observed an interesting event in an international toy exhibition. Two toy cars were moving forward in a monorail. Toy car #1, weighing 0.5 kg, was ahead of toy car #2, weighing 1.5 kg, in the beginning, but they collided and joined together. The initial velocity of toy car #1 is 1 m/s and that of toy car #2 is 2 m/s. What is the final velocity of both of these cars after they are connected?Assume that there is no friction in this system