How to find the acceleration with which a body freely falling without initial velocity moves?

How to find the acceleration with which a body freely falling without initial velocity moves? What quantities need to be measured for this?

To experimentally measure the acceleration of gravity, it is necessary to throw a body from a certain measured height (S) and time the time before it falls to the ground (t).

Then the acceleration of gravity can be calculated by the formula:

g = 2S / t2.



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