关于动量和冲量的单位,下列说法中正确的是(    ) A.1 kg·m/s=1 N

关于动量和冲量的单位,下列说法中正确的是(    )

A.1 kg·m/s=1 N·s                            B.动量的单位可以用N·s

C.冲量的单位可以用kg·m/s                    D.动量和冲量的单位不能互换

答案

C


解析:

在这个过程中原子核和它释放出的粒子构成的系统,满足动量守恒定律且总动量大小为零,选取v0的方向为正方向.

0=mv0+(M-m)v,v=-v0,方向与v0的方向相反.

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