Is E=mc^2 Explained Correctly?

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Brian1952
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I am doing an article that includes a brief explanation of Einstein's basic equation, and want to check my work. As I understand it, the equation is e(energy in Joules)=m(in grams)×speed of light in meters/second squared(9×10 to the 16th). Is this reasonably correct? Thanks.
 
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Kilograms it is. Thanks to both for the double-check!
 
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