Question

Define an expression for free falls

Answer 1

Free falls are something that if we drop something from a height in the the absence of air then the object will reach the surface at the same time. Dose'nt matter you are throwing rock or a feather.

Hope the answer is clear !!

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Answer 2

free fall is any motion of a body where gravity is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it.