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如图所示,固定斜面上除AB段粗糙外,其余部分光滑,物块与AB段间动摩擦因数处处相同。当物块从斜面顶端滑下后,经过A点的速度与经过C点时的速度相等,且AB=BC.已知物块通过AB段和BC段所用时间分别为t 1和t 2,动量变化量分别为△p 1和△p 2,则( )
A.t 1=t 2, △p 1=△p 2 B.t 1>t 2, △p 1=△p 2 C.t 1<t 2, △p 1=△p 2 D.t 1=t 2, △p 1=-△p 2
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