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5 kg 在 30° 斜面上。下滑加速度(无摩擦)。(答: g/2 approximately equals 4,9 m/s²。)
5 kg 在 30° 斜面上。下滑加速度(无摩擦)。(答: g/2 approximately equals 4,9 m/s²。)
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