To calculate the terminal velocity of a typical meteorite just before it hits Earth, Hanna needs the following information:
A typical meteorite’s weight, surface area, and coefficient of drag; air density close to Earth.
This information is crucial because the weight (or mass) of the meteorite, along with the surface area and coefficient of drag, will help determine the forces acting on the meteorite as it falls through the atmosphere. The air density is also necessary, as it affects the drag force experienced by the meteorite.