Please help with these questions! Instructions are included in the documents shown below, pls let me know if they are not visible enough.

Link to video you will need: https://physics.highpoint.edu/~atitus/videos/

Scroll down to 'Videos' and find the one titled 'Constant velocity rolling ball - slow' and click on 'uniform-motion-ball-slow.mov'

Link to the tracker install: https://physlets.org/tracker/