- #1

- 93

- 1

I know that,

E

_{1}= E

_{0}+ E

_{K}, and

E

^{2}= (mc

^{2})

^{2}+ (pc)

^{2}= E

_{0}

^{2}+ E

_{K}

^{2}, but

E

_{0}+ E

_{K}≠ (E

_{0}

^{2}+ E

_{K}

^{2})

^{1/2}

Is one of them wrong?

Why the pythagoras theorem is used in the second equation?

Thanks.