Gravitational force:
Measure of how hard earth pulls on an object, also called weight of an object, non contact force.
In this experiment 2 books. Both object hits the ground at the same time regardless their weight.
Acceleration of gravity of a free falling object on earth is 9.8m/s/s o's the same for all free falling object regardless of how long they been falling, or whether they were initially dropped from rest or thrown in the air.
Claire Tabuteau
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