Two 125 kg bumper cars are moving toward each other in opposite directions. car x is moving at 10 m/s and car z at –12 m/s when they collide head–on. if the resulting velocity of car z after the collision is 10 m/s, what is the velocity of car x after the collision?
–12 m/s
–10 m/s
10 m/s
12 m/s

Consider the phase change taking place in the picture. you could use all but one statement to describe what is happening here. that is: a) temperature is increasing. b) kinetic energy is increasing. c) the space between the particles remains the same. d) the attractive force between the particles is decreasing.