The independent variable in the experiment is the different mass of the blocks.
Independent variable is the variable that is changed or manipulated in a series of experiments.
On the other hand, the dependent variable is the variable that is measured to see the effectiveness of the treatment.
According to this question, a student drops three blocks from the same height and measures the time it takes for the blocks to hit the ground. However, each block has a different mass.
This means that the independent variable in the experiment is the different mass of the blocks.
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