It is said that Galileo (1564-1642) dropped balls of various weights from the top of the
Leaning Tower of Pisa to refute an Aristotelian belief that heavier objects fall faster
than lighter objects.

If the balls were dropped from a height of 54 meters, how long
did it take for the balls to hit the ground?

Answer:

To solve this problem, it is necessary to know that the gravity of the earth accelerates objects
at a rate of 9.8 meters per second squared and then use the laws of gravitation formulated
by Isaac Newton (1642-1727).

The distance that an object travels under constant acceleration is given by the formula: