Question

A 220 g cart moves on an air track (a one-dimensional system in which motion is friction free) at 1.3 m/s. It collides with and sticks to another cart of mass 550 g, which was moving in the opposite direction at 0.80 m/s before the collision. What is the velocity of the composite cart after the collision? (Answer: 0.2m/s Direction)

Answer is provided above. Please show all work on how to get the answer.