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> 如图所示，斜面体B固定在地面上，金属块A沿B的光滑斜面下滑，在下滑过程中，下列说法正确的是（　　） A．B对A的支持力的冲量为零 B．B对A的支持力做功为零 C．重力对A做的功，等于A的重力势能的增量 D．重力对A的冲量，等于A的动量的增量

问题：

发布时间：2024-09-07

如图所示，斜面体B固定在地面上，金属块A沿B的光滑斜面下滑，在下滑过程中，下列说法正确的是（　　）

A．B对A的支持力的冲量为零

B．B对A的支持力做功为零

C．重力对A做的功，等于A的重力势能的增量

D．重力对A的冲量，等于A的动量的增量

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