A225 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?

The final velocity of the combined bumper car is 1.2 m/s

Explanation:

The more collisions we have, the decrease the velocity.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.