Velocity is speed plus direction, so an example of velocity would be a vehicle traveling at 75mph north. Velocity is a vector quantity because it describes both magnitude and direction.
A physical change in something doesn't change what the it is. For example, if you break glass, it will still be glass. In a chemical change where there is a chemical reaction, a new thing is formed and energy is either given off or absorbed. For example, when you burn a log. The carbon in the log is reacting to the oxygen to create ashe and smoke
Explanation:
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Answer:
1 is 90, 2 is 200 and 3 is 5
Explanation:
im big brain so i know lol
Answer:
harmful effects
1. that will cause air pollution
2. that will destroy our earth
