In the scene where the guys are going to jump the bridge w/ the car, Ruben adds the weight of the car, luggage and people in the equation. If you know anything about physics, you know that all objects fall at the same rate regardless of the weight (it's called gravity). Ruben makes his error even more ridiculous by confirming that "With physics I'm always sure".
Ruben was talking about the acceleration required to get the car airborne and across a ten-foot gap with their combined weight and the luggage in it, not about how fast it'd fall once it got into the air.
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