you notice the extreme deformation of the ball as it bounces. There must be a lot of force being put on that ball! You decide to try and figure out the average force on a bouncing rubber ball. Setting up your own experiment, you drop a 0.55 kg ball off a 26 m tall building and see that it rebounds back up 16 m after bouncing. An accomplice with a high-speed camera records the bounce and tells you that the ball was in contact with the sidewalk below the building for 7.5 ms (milliseconds).