1. The problem statement, all variables and given/known data I would like to know how I calculate mass of a ball based on a video. I can measure the speed of the ball at any point using Coach 3 (computer program). I know g=9.81m/s2 for the rest i don't know anything. I would like to know the way to calculate the mass of the ball in this video: 2. Relevant equations F=m*a ? E=mc2 ? 3. The attempt at a solution I have no clue, i only know the velocity of the ball. Thanks in advance for reacting to this thread.