如图所示,一个小球从光�斜面的顶端自由下�经过a点到达斜面底端,如果小球经过a点时具有的重力势能为50j,若不计空气阻力,以下说法不正确的是 Template




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tomski如图所示,一个小球从光�斜面的顶端自由下�经过a点到达斜面底端,如果小球经过a点时具有的重力势能为50j,若不计空气阻力,以下说法不正确的是 coloring