Find the speed needed to escape from the solar system starting from the surface of earth. assume there are no other bodies involved and do not account for the fact that earth is moving in its orbit. [hint: equation 13.6 does not apply. use equation 13.5 and include the potential energy of both earth and the sun.

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?

What is the magnitude of the acceleration vector which causes a particle to move from velocity −5i−2j m/s to −6i+ 7j m/s in 8 seconds. answer in m/s.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration