In this activity, you’ll use a video measurement and analysis tool called Tracker to examine the motion of a car and relate it to the work-energy theorem. Tracker is a free scientific tool available through the Open Source Physics Project. To begin your investigation, open this tracker experiment: Start-Up Energy Click play (A play button.) to watch the movie. At certain points in the activity, you may also wish to rewind (A rewind button.) id the video or step forward (A step forward button.) or backward (A backward button. ) one frame at a time. Play the movie once and watch the progress in the graph. Now answer the following questions: Part A Describe the velocity of the car over time and relate that to how the kinetic energy should be changing over time.