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在匀变速直线运动中,全过程的平均速度等于中间时刻的瞬时速度,也等于始、末速度和的一半,即(?).用这一公式,可使解题变简捷.
In uniform linear motion, the average speed of the whole process is equal to the instantaneous speed at the middle moment, which is also equal to half of the sum of the initial and final speeds, that is (?). With this formula, the problem can be simplified.