Which Equation is right?

  • Thread starter Atran
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  • #1
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Main Question or Discussion Point

Hi,

I know that,

E1 = E0 + EK, and
E2 = (mc2)2 + (pc)2 = E02 + EK2, but
E0 + EK ≠ (E02 + EK2)1/2

Is one of them wrong?
Why the pythagoras theorem is used in the second equation?

Thanks.
 

Answers and Replies

  • #2
DrGreg
Science Advisor
Gold Member
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759
Hi,

I know that,

E = E0 + EK, and
E2 = (mc2)2 + (pc)2
Correct

... = E02 + EK2
Incorrect

E2 = E02 + 2 E0EK + EK2
 

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