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In the equation E=mc2 'c' is equal to the speed of light (in a vacuum) or 2.997*108.

or...

186282.397 miles per second

670616629 miles per hour

Or if you're metric

1.07925285 × 109 kph

299792458 metres per second

* * * * *

Actually, the equation "works" only in SI units. With any other units you will need to introduce a constant which is based on the units used.

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12y ago

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