And in your second assignment, which you haven't seen yet I'm asking you to calculate the gravitational acceleration for me using these both experiments.
在各位还没看到的，第二次作业中，我会要求各位，凭借这两个实验的结果，来算出重力加速度。
2
and gravity gives you an acceleration of 9.8 meters per second squared.
因为地球的重力,提供了9。8米/秒2的加速度。
3
And if you calculate, if you assume that - the acceleration is constant — it's an easy calculation — it turns out that the acceleration is only two meters per second squared.