8.一个物体以某一初速度v0沿一粗糙斜面�上�动经时间t1上升到某高处后又沿该斜面�下经t2时间�动到原处在�动中物体只受重力和斜面对它 Template




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tomski8.一个物体以某一初速度v0沿一粗糙斜面�上�动经时间t1上升到某高处后又沿该斜面�下经t2时间�动到原处在�动中物体只受重力和斜面对它 coloring