(section: 2 / line: b)
Yes, 2 teams may share the same track.
(section: 2 / paragraph: b / line: 2)
Mass is determined based upon a successful run.
(section: 3 / line: 21)
Yes. General rule #2 applies: https://www.soinc.org/ethics_rules
(section: 3 / paragraph: f / line: 1)
No, a dowel by definition is a solid cylindrical rod.
(section: 4 / paragraph: c / line: 1)
(section: 5 / paragraph: b / sub-paragraph: ii / line: 1)
(section: 5 / paragraph: b / sub-paragraph: ix / line: 21)
Yes. Although note that if the vehicle stops by design (i.e. in order to stall for time), that is not allowed as it is a potential safety hazard and is not within the spirit of the rules.
(section: 6 / paragraph: f / line: 1)
No. The mass and time scores can come from different successful runs.