Looking at the table, she noticed that adding up all the masses of the items in the backpack equaled the total mass of the full backpack. What did this demonstrate about mass?
A.
The mass of a whole object is equal to the sum of the masses of its parts.
B.
The mass of a whole object is less than the sum of the masses of its parts.
C.
The mass of a full backpack does not depend on what is in it.
Answers: 3
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