29.一物体从16m高的a处自由落下下落途中经过b点时的速率是落地时速率的3/4.那么在下落过程中物体的机械能 选填“守恒 或 Template




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tomski29.一物体从16m高的a处自由落下下落途中经过b点时的速率是落地时速率的3/4.那么在下落过程中物体的机械能 选填“守恒 或 coloring