D) A gallon of gasoline definitely. Gas is like, if not a chemical. It will have the most.
~Silver
C or "Density" The granite rock has a much higher density than the Styrofoam.
The position of the first ball is

while the position of the second ball, thrown with initial velocity
, is

The time it takes for the first ball to reach the halfway point satisfies



We want the second ball to reach the same height at the same time, so that




To find the scientific notation, you need to divide at the decimal by the power of 10. So since there are 2 powers of 10, what you want to do is move the decimal 2 places to the left which will give you: .054