What does the slope of the line represent on a velocity vs time graph

How would doubling the made of an object change the objects potential energy

Aregular polygon has angkes of size 150° each.how many side has the polygon

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?