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Above they use the equality that the massless energy hv is equal to einsteins energy. Both have the same velocity. How can not this mean that einsteins formula has more energy then the other. I have added a proof of einsteins formula just in case it can be used:

In the proof above I don't know why the speed stops at c. But at least c is the same speed as in E=hf.

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# Problem about equality of energy formulas

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