calculate the escape velocity.?

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shortypr16

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Calculate the escape velocity from Mars.
Mars Mass = 0.6424x1024 kg
Mars Radius = 3398 km
G = 6.67x10-11Nm2/Kg


Vescape = (the square root of) 2GM/R
this is the equation.. i think i did it right but im not quite sure what the Nm2/Kg means?? Any help
 
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