Answer:
d) all notebooks would fall at the same time
Step-by-step explanation:
One thing you learn in Physics class is that acceleration due to gravity is the same for all objects: their change in speed as a function of time is not dependent upon their weight.
For similar objects (notebooks) falling from desk-top height, the effect of air resistance is probably negligible, and is unlikely to be measurable in a casual experiment of the sort described here.
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If you assume heavier objects fall faster, then answer selections b and c both would have to be correct. If you assume there is only one correct answer, it must be d.
