ANSWERS: 2
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In unit-specific terms, E (joules or kg·m²/s²) = m (kilograms) multiplied by (299,792,458 m/s)2.
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E represents energy (Joules), m represents mass (Kg), and c² is a very large number, the square of the speed of light. http://www.aip.org/history/einstein/emc1.htm
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