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如图1所示,倾角为θ、质量为M的斜面放在光滑水平面上,一小物体(质量m,看做质点)从斜面顶端自由下滑.设斜面高为A,不计一切摩擦.本
As shown in Fig.1, the inclined plane with inclination θ and mass M is placed on a smooth horizontal surface. A small object (mass m, seen as a particle) slides freely from the top of the inclined plane. The slope height is A, excluding all friction.