Question: The earth has a mass M = 5 . 9 7 2 E 2 4 kg and radius R = 6 3 7 2 km

The earth has a mass M

= 5.972

24

kg and radius R

= 6372

.

Suppose your friend wanted to throw a

145.0

g baseball parallel to the ground from a hot air balloon

20, 000.0

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?

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