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在自由落体教学中经常有同学提出这样的问题:由伽利略公式s=1/2gt~2可知,路程是时间的二次函数,为什么物体自由下落时的轨迹是直线而不是抛物线呢?在
In free fall teaching, there are often students who raise the question: Given the Galileo formula s=1/2gt~2, the distance is a quadratic function of time. Why is the path of a free fall of object to be a straight line instead of a parabola?