Since if i throw something up ,it's gonna come down ; but if i throw it enough fast it's not going to come back since the $g$ gets smaller with distance, So it'll go and slow down ....
If i send it with any less energy ,it'll come back ,;
Assuming there is nothing in the way or other gravitational fields
Btw is that energy equal to The pe of the object relative to the earth's center ;Not just 9.8 *d but the integral
