设雨滴从很高处竖直下落所受空气阻力f和其速度v成正比.则雨滴的运动情况是a先加速后减速最后静止b先加速后匀速c先加速后减速直至匀速d Template




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tomski设雨滴从很高处竖直下落所受空气阻力f和其速度v成正比.则雨滴的运动情况是a先加速后减速最后静止b先加速后匀速c先加速后减速直至匀速d coloring