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【简答题】
在图中，均质定滑轮和动滑轮质量均为m，半径皆为r，重物A质量为m 1 ，重物B质量为m 2 ，设m 2 ＞(2m 1 -m)。不计绳索的质量，求重物B由静止开始下降距离h时的速度和加速度。
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