Gravity Racer

Q. I am a coach for the Gravity Racers. One quick clarification so I can help the students practice: where is the racer launched on the ramp? Is this a marked line or can it be chosen by the students for each of their individual launches?

A. Where they start the racer is one of the 2 variables students can use to modify the distance traveled, the other being the angle of the ramp.