人静止于光滑冰面上,现欲前进,下列方法中可行的是(    ) A.

人静止于光滑冰面上,现欲前进,下列方法中可行的是(    )

A.向后踢腿

B.手臂向前甩

C.在冰上滚

D.脱去外衣向后投掷

答案

D


解析:

欲使物体获得一定的动量,必须有外力作用在该物体上.A、B两种方法属于物体两部分间的作用,不会对物体产生冲量;因冰面是光滑的,故C也不行.

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