What is the name of the molecule compound n2h4

After a big snowfall, you take your favorite rocket-powered sled out to a wide field. the field is 195 m across, and you know that your sled accelerates at a rate of 3.65 m/s2 when the rocket is on. how much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time?

Phase changes are chemical changes. true or false

Which changes of state do the labels represent? a: b: c: