Which of the following quantities are unknown?
initial separation of the particles final separation of the particles
initial speed of the proton initial speed of the alpha particle final speed of the proton
final speed of the alpha particle mass of the proton mass of the alpha particle
charge of the proton
charge of the alpha particle

Which expression allows you to determine the mechanical advantage of an inclined plane? a. height of plane / input force b. length of plane / input force c. length of plane / height of plane d. height of plane / length of plane

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?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?