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diff --git a/629/CH6/EX6.11/example6_11.sce b/629/CH6/EX6.11/example6_11.sce
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+clear
+clc
+//Example 6.11 PROPELLANT MASS RATIO FOR ACHIEVING ORBITAL VELOCITY
+Vbo=7600; //orbital velocity[m/s]
+Isp=3200; //specific impulse[m/s]
+//Vbo=Isp*log(mi/mf)
+mif=exp(Vbo/Isp) //mif=mi/mf
+//mp=mi-mf
+mpi=1-1/mif //mpi=mp/mi
+printf("\n The ratio of propellant mass to initial mass to achieve orbital velocity = %.3f.\n",mpi)
+\ No newline at end of file