A 0.250 kg cart moving at 0.400 m/s has how much momentum? In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other. The red cart has a velocity of 2 m/s and the blue cart has a velocity of -1 m/s. The carts stick together when they collide. What is their final speed? Which of the following objects has the greatest momentum? A 0.05 kg object rolling at 0.2 m/s, A 0.15 kg object rolling at 2 m/s, A 0.15 kg object rolling at 1 m/s, A 0.4 kg object rolling at 2 m/s.