*no mass was given*
2.
suppose two ball bearings are initially a horizontal distance 20 m apart while 400 m above the surface
of moon. by how much does the separation between them decrease as they fall 400 m to the surface?
(this decrease would be attributed, classically, to a “fictitious force” that pushes the particles together.
a fictitious force is often called a “tidal force” in the context of motion in a gravitational field.) if you
could measure separations to an accuracy of 1 mm during the fall, or if your experiment requires that
the change of separation remains < 1 mm, is such a freely-falling frame inertial?