In a 100-metre sprint, when do athletes reach their highest speed? When do they accelerate at the highest rate and at what point, if any, do they stop accelerating? In episode four of the Shedding Light on Motion series, we look at how graphs can help us better understand the motion of athletes and of cars and other things.

Streaming video file encoded with permission for digital streaming by Infobase on November 09, 2016.

Graphing Motion: Introduction --(0:58) -- Distance vs. Time Graphs -- (10:52) -- Velocity vs. Time Graphs -- (10:29) -- Acceleration vs. Time Graphs -- (5:25) -- Credits: Shedding Light on Motion: Episode 4-Graphing Motion -- (0:26).