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> 下列关于力和运动的说法中，正确的是 A．物体所受的合外力为零，它的动量一定为零 B．物体所受的合外力的功为零，它的动量变化一定为零 C．物体所受的合外力的冲量为零，它的动量变化一定为零 D．物体所受的合外力不变，它的动量变化率改变

问题：

发布时间：2024-09-09

下列关于力和运动的说法中，正确的是

A．物体所受的合外力为零，它的动量一定为零

B．物体所受的合外力的功为零，它的动量变化一定为零

C．物体所受的合外力的冲量为零，它的动量变化一定为零

D．物体所受的合外力不变，它的动量变化率改变

参考答案：

提问用户：Kn***mJt

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