A 225 kg red bumper car is moving at 3. 0 m/s. It hits a stationary 180 kg blue bumper car. The red and blue bumper cars combine and hit a stationary green bumper car of mass 150 kg. The red, blue, and green bumper cars all combine. What is the final velocity of the combined bumper cars? 0. 93 m/s 1. 2 m/s 1. 7 m/s 2. 7 m/s.