I think it’s either A or B
Answer:
Color, formation, gas, odor,
Explanation:
- change are a change in color
- formation of a precipitate
- formation of a gas
- odor change
- temperature change
400m in 32sec: (400/32)>12.5meters per second>
(12.5)(60)(60)(1/1000)=45km per hour
Constant speed would mean that the two forces are equivalent