已知g，可以通过m = g/g来求得质量m，其中g是重力加速度，等于9.8牛顿每千克（n/kg）。 因此，1kn等于1000牛顿除以9.8牛顿每千克，结果是102.04公斤。 2. E_ {k}=\frac {1} {2}*\frac {m_ {r}^ {2}} {m}*\omega^ {2}=\frac {1} {2}*\frac {m_ {r}^ {2}} {m}*\frac {v^ {2}} {r^ {2}}=\frac {1} {2}*m*v^ {2} 由于刚体转动中的 v 为外沿的转动速度，因此有 v=\omega*r 。
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