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> 如图7—2所示，质量为2kg的物体A放在光滑的水平面上静止，与水平方向成30°角的恒力F=3N作用于物体历时10s，则： A．力F对球的冲量大小为30N·s； B．力F对物体的冲量大小为N·s； C．物体动量的变化量为kg·m/s； D．以上说法都不对。

问题：

发布时间：2020-03-13

如图7—2所示，质量为2kg的物体A放在光滑的水平面上静止，与水平方向成30°角的恒力F=3N作用于物体历时10s，则：

A．力F对球的冲量大小为30N·s；

B．力F对物体的冲量大小为N·s；

C．物体动量的变化量为kg·m/s；

D．以上说法都不对。

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