A ball bearing is dropped from rest at point A. At the instant it passes mark 3.5m below A, another ball bearing is realeased from rest from a position of 4.5m below A. At what time after its release will the second ball bearing be overtaken by the first? How far does the second ball bearing fall in that time? I know i have 2 distances and it starts at rest so it doesn't have an intial velocity i also know all falling objects have an acceleration of -9.8 so i used the formula d=1/2a(t)^2 and i used 3.5 for d -9.8 for a and t is my unknown so what am i doing wrong?