It's useful to have the average acceleration, which you can find by taking similar differences of velocities.

平均加速度也是很有用的,你可以用类似方法,取速度的变化量求出来

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Oh, and not totally unconnected, accelerated smartphone adoption has been accompanied with the acceleration of app downloading, with that acceleration the average number of apps per smartphone has jumped 66%, from an average of 30 up to 49.

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India's acceleration in trend growth, from an average of about 6% in the late 1980s to as much as 10% (and, some hoped, beyond), may sound modest.

ECONOMIST: India��s economy