The earth has a mass M$=5\mathrm{.}972$E$24$kg and radius R$=6372$km$.$ Suppose your friend wanted to throw a $145\mathrm{.}0$ g baseball parallel to the ground from a hot air balloon $20,000\mathrm{.}0$ m above sea level. Neglecting air resistance and height changes of the landscape, at what speed v would the baseball need to have after your friend throws it$,$ to enter free$-$fall orbit and never fall to the ground?