Free Fall.
A free falling object is an object that is falling under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state offree fall
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Here you can find information about the free fall and its characteristics http://www.physicsclassroom.com/class/1dkin/u1l5a.cfm
In this page you can see the formula for the free fall and chat with a tutor to ask him your doubts http://formulas.tutorvista.com/physics/free-fall-formula.htmlIn this page you can find problems about this theme http://www.physics-prep.com/index.php/practice-problems-free-fall