How much energy will be necessary for making a body of 500 kg escape from the earth [ g=9.8 m/s2 , radius of earth =6.4×106 m ]

Potential energy of a body at the surface of earthPE=−GMmR=−gR2mR=−mgR=−500×9.8×6.4×106=−3.1×1010JSo if we give this amount of energy in the form of kinetic energy then body escape from the earth.