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Saiyar said:
His math is wrong. If he is using m/s for gravity then he needs to use meters for the radius aswell, otherwise the system falls apart. He really should be using SI units for everything.

Also, I wonder what he put in for Mario's mass?

Google calculator performs any necessary unit conversions.  Try it out sometime, it's awesome when you put in a calculation in 17 different units and it just spits out the answer you want.

BTW, there are good reasons for using the imperial system instead of metric.