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Two toy dart guns have plastic darts and are fired towards the ground… the results are that the darts hit the ground at the same time. What are the results if one of the darts is made heavier by adding a metal weight to it. Now when the guns are fired towards the ground, which dart will hit the ground first. The light one, the heavy one, or they hit at the same time once again. This is the question explored in this video with a quick explanation according to Galileo's idea of accelerating falling bodies and Newton's second law that explains that that explains the relationship between force mass and acceleration.