4.如图所示质量为m的物体在恒力f的作用下以一定的初速度竖直�上运动物体的加速度方��下空气阻力不计则物体的机械能 A.一定增加 B Template




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tomski4.如图所示质量为m的物体在恒力f的作用下以一定的初速度竖直�上运动物体的加速度方��下空气阻力不计则物体的机械能 a.一定增加 b coloring