A rocket accelerates upward while a ball is fired into the opening in the rocket as shown in the animation (position is given in meters and time is given in seconds). A very wealthy individual propose...A rocket accelerates upward while a ball is fired into the opening in the rocket as shown in the animation (position is given in meters and time is given in seconds). A very wealthy individual proposes to dig a hole through the center of Earth and run a train (the small black circle) from one side of Earth to the other as shown in the animation (position is given in Earth radii and time is given in seconds).
