Why is the es­cape ve­loc­ity an im­por­tant fac­tor in launchg it?

All About Space - - Michio Kaku -

Well, us­ing New­ton’s laws of mo­tion and grav­ity we can cal­cu­late that to or­bit the Earth, you have to go at about 18,000 miles per hour [29,000 kilo­me­tres per hour].

To es­cape the grav­i­ta­tional field of the Earth you have to go about 25,000 miles per hour [40,000 kilo­me­tres per hour]. So ev­ery Moon rocket [in this case, the Fal­con Heavy] has to have a ve­loc­ity of at least 25,000 miles per hour in or­der to es­cape Earth.

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