a bullet fired from a rifle.

来源：学生作业帮编辑：大师作文网作业帮分类：英语作业时间：2024/11/12 22:06:18

a bullet fired from a rifle.
a football quarterback running at top speed
a horse walking at about 2miles/hour
哪个动量最大?

1.从枪膛射出的子弹；
2.一个足球四分位运动员的最高奔跑速度
3.一匹马行进速度为2英里/小时
1.如果子弹重量为0.1kg,出膛速度为1000m/s,则动量为100
2.如果足球运动员重70kg,最高速度为8m/s,则动量为560；
3,如果马重200kg,速度为1m/s,则动量为200.
所以我选2.

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