A graph of average speeds versus time can give the acceleration due to gravity of the falling object.

平均速度——时间图表可以给出这个自由落体的重力加速度。

The slope of the best fit line for distance doubled and time squared gives the acceleration due to gravity.

距离的两倍与时间的平方的最佳拟合曲线的斜率就是重力加速度。