A rolling ball can gather moss

Mason releases the ball from a fixed height. This produces a repeatable speed for the ball, allowing multiple identical runs.

Gina holds the tape measure at the "origin" - zero centimeters, from which the timers started their stopwatches.

Timers mark where the ball was at one second, two seconds, three seconds, and so forth. Each timer has a stopwatch, each keeps track of the their own "seconds" assignment.

The three standing were three, four, and five seconds. In the background the measurements to the time positions are being made. This procedure makes time the independent variable and distance the dependent variable.

Clyde and Warren work from chalk marks that denote the location the timer was at.
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