8. 如图所示,排球比赛中运动员将排球从M点水平击出
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8. 如图所示,排球比赛中运动员将排球从M点水平击出,排球飞到P点时,被对方运动员击出,球又斜向上飞出后落到M点正下方的N点,N点与P点等高,轨迹的最高点Q与M等高,不计空气阻力,下列说法正确的有( )
A.排球两次飞行过程中加速度相同
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