The apt hypothesis here is; objects fall at the same rate is the have the same acceleration in the absence of air resistance.
A hypothesis is an if ---- the statement that often serves the purpose of explaining an observation. In the experiment of Galileo, the aim was to ascertain if objects with different mass fall at the same, or different, rates in the air and in a vacuum.
The apt hypothesis here is; objects fall at the same rate is the have the same acceleration in the absence of air resistance.
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