What Goes Up... This "worksheet" begins with a group experiment outside (I chose the tennis court). I had a regular ball (pink rubber or tennis) and I bounced it as hard as I could as the students timed the time it took for the ball to go up and come back down. We repeated the experiment with a super bouncy ball (space ball). If you have a baseball/softball player or quarterback in the class, you can get a really high bounce. After some calculations, the worksheet continues with more practice examples.