I was doing the equation of E=mc^2(adsbygoogle = window.adsbygoogle || []).push({});

So its like this:

If M = 1kg and C=300 million m/s,

Then E= 1 x 300 million x 300 million = 90 000 million joules/90 billion joules

But the qs is,

If I convert c to 0.3 billion m/s,

then E = 1 x 0.3 billion x 0.3 billion = 0.09 billion joules

Why are both different? Can anyone explain the error?

Thanks (:

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# Mathematics qs

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