如图8-7-7所示是A、B两滑块在光滑水平面上碰撞前后的闪光照片部分示意图.已知A、B的质量分别是m1=0.14 kg,m2=0.22 kg,所用标尺的最小刻度是0.5 cm,闪光照相时每秒拍摄10次,试根据图示回答: (1)碰撞前后滑块A的动量增量大小是_____,方向_____; (2)碰撞前后A和B的总动量______(填“守恒”或“不守恒”),因为__________. 图8-7-7 —_____ David _____early every day? —Yes, he does.He always gets up early every day. A.Do;get up B. Does;get up C. Does;gets up