https://www.youtube.com/watch?v=EDNZsB4naDA
Feat happens at 8:30.
http://i.imgur.com/f3eDnHk.jpg
Timeframe - 14 frames or 0.56 seconds
Average 11 Year Old Height - 143.5 cm or 78.4 px
http://i.imgur.com/S6erKRw.jpg
Distance Traveled - 307 px
307/78.4 = 3.92x
3.92*143.5 = 562.52 cm
562.52 cm/0.56 seconds = 10.04 m/s
Results
Red and Blue Dash Backwards - 10.04 m/s, Peak Human