Pls help i’ll give brainliest if you give a correct answer!!

Which term best describes the phrase “something that happens”?

Astate of matter all that has define volume and can flow is a(n)

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?