How does a free-body diagram tell you about the acceleration of an object? explain.

A free-body diagram shows the vectors for all the forces acting on the body.  The resultant vector found by summing all the individual vectors represents the net force. 

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We know, acceleration is the force due to gravity, so as object is falling (free-body), acceleration would be negative (as directions are opposite), and if the body is on earth it's magnitude will be 9.8 m/s²

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So what is the question