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 (:

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Mathematics qs

**Physics Forums | Science Articles, Homework Help, Discussion**