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clc;
re=6.4*10^6;  //radius of earth in m 
g=9.8;     //gravitational constant in m/sec square
G=6.67*10^-11;  //Universal gravitational constant in Nm square/kg square
m=(g*re*re)/G;  //calculating mass of earth in kg
disp(m,"Mass of Earth in kg = ");  //diaplaying mass of Earth inkg