Free fall in a vacuum: a steel ball and a pith ball with the same diameter are loaded into the top of a large drop tube, which is evacuated to create a very low-pressure environment. The two balls are released simultaneously from the same level to fall to the bottom of the tube. Which one of the following statements is true? a. Steel ball reaches the bottom first. Why?
b. Pith ball reaches the bottom first. Why?
c. Two balls reach the bottom simultaneously. Why?