The part of the experiment that Sara wanted to create to determine the object's weight is when she told her mother to drop both weights at the same time from a window.
This refers to the force of gravity on an object that can be calculated as the mass times the acceleration of gravity.
In order to determine whether an object's weight determines how fast it will fall, Sara asked her mother to drop both weights at the same time from a window.
Therefore, the Option D is correct.
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