送交者: lala 于 October 04, 2011 17:00:05:

回答: "too simple，sometimes naive":)) 由 玩笑 于 October 04, 2011 15:00:11:

can conclude that

v(t)/t => 0 as t => infinity.

Is it possible that

v(t) = a log t for some constant a > 0

or

v(t) = a t^{b} for some constants a > 0 and 0 < b < 1?

加跟贴