如图所示的小球从a点由静止释放它从a点�b点�动的过程中小球受到的重力对小球做功小球的重力势能在减小.当小球运动到b点时它受到的力是不 Template




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tomski如图所示的小球从a点由静止释放它从a点�b点�动的过程中小球受到的重力对小球做功小球的重力势能在减小.当小球运动到b点时它受到的力是不 coloring