物体在合外力作用下做直线运动的v T图象如图所示.下列表述正确的是 A.在0 1s内合外力做正功b.在1 2s内合外力做负功c.在1 Template




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tomski物体在合外力作用下做直线运动的v t图象如图所示.下列表述正确的是 a.在0 coloring