A deflated basketball was weighed and its mass was 400g. After air was pumped into it, its mass was 415g. This shows that __________.
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Worked Solution
Step 1: Identify the change in mass (415g - 400g = 15g).
Step 2: The only thing added was air.
Step 3: Therefore, the 15g increase comes from the air added.
Correct answer: air has mass
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