Free fall

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This experiment demonstrates that in the absence of air resistance, two freely falling bodies, when released from the same height, they take the same time interval to reach the ground. This shows that both bodies gain the same amount of speed as they fall (otherwise, one will get ahead of the other and hence reaches the ground first). Since both bodies gain the same amount of speed during the same time, both must have the same acceleration, which is the acceleration of free fall. The reason why we usually see heavy bodies reach the ground before light bodies is that the effect of air resistance on light bodies is more tangible than on heavy bodies.