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Just discovered your informative forum. In these times of stupidity, its good to see people with a love of knowledge.

A friend asked me the following question:

"if you know the mass & speed of a plane, can you use this theory

to calculate it's energy?"

I assume the answer is no because c has to be a constant (the speed of light).

Can someone please enlighten me as to whether the equation can be used in this manner?

Thanks alot