Hello Guys, This is my first post here. I need help on my homework that I have been working on all evening. Basically I am given video data. 10 trials of a plastic ball in projectile motion. I have to use Logger Pro. Four things I need to find out for each trial: x-velocity y-velocity launch velocity from x data launch velocity from y data I analyzed the video already. x velocity will the slope of the linear fit equation. In this case velocity is constant and acceleration is zero. How do I find y velocity!? I believe launch velocity will be found out using Pythagoras theorem using the first x-velocity value and y velocity value. I am very confused about this. Can somebody show me the way? Thanks!