This is an integral plot of 0.00980665*e^(-0.000156961*x), Earth's gravity in exponential form. The integral to infinity will give the total GPE. If a body were to escape Earth's gravity field totally then, it needs at least this amount of kinetic energy.
(0.5)V2 = 63 (from the plateau value on the graph), therefore V = 11.22 kms-1.
Which is consistent with established facts.
