Oh Peg, Peg, Peg... simple, sweet Peg.
See, it goes like this... first they point the rocket up towards the sky, then they wind up the rubber bands which creates cyntrifical (which is apparently a word only NASA recognizes cause my spell check is flagging it) force, then they turn on the fire boosters which serve only the purpose of burning thru the rubber bands. When they break, which can take up to 25 min. depending on their width, the rocket is launched at the unimaginable speed of 90 mph. With wind resistance, something you couldn't possibly understand, the rocket is slowed to approx. 75 mph, however, because the pilot is unable to pull the rocket over in the event of an officer monitoring his speed, he slows the rocket, using his hy-draul-ic braking system... I know... another big word! And slows the whole thing down to a safe 70 mph.
I know so much it's hard to fit it all into one simple paragraph, but for now, you'll have to be content with this amazing knowledge I've afforded you. A little peek into my mind. Be well.