Ineed some with question 4. i believe the answer is 3 h to 4 h but i'm not sure

Apossible explanation for a set of facts that can be tested by further investigation is called

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?

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?