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Weight has nothing to do with how fast things fall, only wind resistance. Take two 16 ounce soda bottles, open one drink eight ounces. The unopened bottle is twice as heavy as the opened bottle. Close the bottle you just drank half of and drop them at the same time from a tall building, they will hit the ground at the same time. That is because gravity is a constant and the velocity of any falling object is 9.8 meters per second/per second.

Acceleration is the same for all objects at 9.8m/sec/sec.

Acceleration due to gravity near the earth's surface is the same for all objects regardless of their mass.

This is because acceleration is inversely proportional to mass:

a = F / m

If you substitute the "force of gravity" equation above for F in this simple equation, and assume m here is m1 there, you'll find you have m1 (mass of the falling object) on both sides of the fraction, so they cancel out - acceleration due to gravity doesn't change with the mass of the object. But the force most definitely does.

Force and acceleration are two very different things. Confusing them leads to wrong answers and further confusion in later topics.

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