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Force=massxaccelaration ie F=ma,F=mx(v-u)/twherem=mass,v-u/t is the rate of changeofvelocity.pressure=force acting per unit area ieP=F/A,F=GMm/R2where F=force,Gis gravitational const Mand m are the 2masses which are placed at adistanceR apart.F=Ma----(1)a=g ie acc.due to gravity   F=GMm/R2------(2)  EQUATINGEquations1and2,f=mg=GMm/R2     Thencancelling  m on both sides g=GM/R2
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