It is an approximation of its mass number. Each isotope of an element has a different mass number.
I think it's B) 30 m/s going down.
Answer:easy
Explanation: ok so the answer is +;<:.";:[]{=+because 7'.]-=
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A chemical change alters the chemical makeup of a substance. So, wood burning would be a chemical change. The others just alter the physical makeup of the substance.
