7.物体在空中以9.8m/s2的加速度加速下降则运动过程中物体的机械能 A.增大 B.减小 C.不变 D.上述均有可能 8如图7 7 Template




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tomski7.物体在空中以9.8m/s2的加速度加速下降则运动过程中物体的机械能 a.增大 b.减小 coloring