So what, now, is the average acceleration?
那平均加速度到底是多少呢？
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。
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。
The average acceleration 2 between time t1 and time t2 2 would then be the velocity at time t2 minus the velocity at time t1, divided by t2 minus t1.
在t1和t2之间的，这段平均加速度2，等于t2时刻的速度2，减去t 1时速度，再除以。
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。
On average the region experienced an acceleration of growth to 2.7 percent from 2.1 percent in 1999, and per capita incomes stabilized following two years of decline.
该地区的平均增速从1999年的2.1%提高至2.7%，人均收入也在连续两年下降之后趋向稳定。
The average impact acceleration and average impact stress of sled train increase approximately in a line with the increase of track deviation.
随着轨道偏差的增大，橇车平均冲击加速度和平均冲击力近似呈线性增长；
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 flame length and fire intensity of 8 forest types were also increased with the acceleration of the average flame speed.
八类林型的火线强度、火焰长度均随着火焰平均风速增加而增大。
The flame length and fire intensity of 8 forest types were also increased with the acceleration of the average flame speed.
八类林型的火线强度、火焰长度均随着火焰平均风速增加而增大。
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