At which times are there forces acting on the cars? 1.) As they speed up while leaving their docking stations.

2.) As they move towards each other at their set velocities.

3.) While they are in contact during the collision.

4.) After they have collided and are no longer touching.

Determine the time it takes for a satellite to orbit the earth in a circular "near-earth" orbit. the definition of "near-earth" orbit is one which is at a height above the surface of the earth which is small compared to the radius of the earth, so that you may take the acceleration due to gravity as essentially the same as that on the surface. does your result depend on the mass of the satellite?