So if you substitute that in there you get an average acceleration which is smaller than zero.
所以如果把它代进来，会得到一个，小于0的平均加速度。
So the signs in the velocity and the signs in average acceleration depend crucially on how I have defined my increasing value of x not where I choose my zero points.
所以速度的符号,和平均加速度的符号,这二者都取决于,这里x正方向,是如何定义的,和0点的选取没有关系。
Find the magnitude of the average acceleration during the interval.
求在这段时间间隔内平均加速度的数值。
Find the magnitude of the average acceleration during the interval.
求在这段时间间隔内平均加速度的数值。
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