Jeg svarte til han over meg, lurte på hva HAN mente med motstand.

Men ja, jeg mener ikke at gravitasjonen påvirker drivkreftene, men den totale fremdriften. Som du sier gjør det jobben med å forlate jorden tyngre. Er ikke alle som har tenkt over at kraften som trekker alt til jorden er veldig begrenset og at det er, til alle praktiske formål, fri flyt ikke så langt fra der vi befinner oss akkurat nå.

[COLOR="Red"]Forøvrig gjør den jobben med å forlate jorden MYE tyngre. For å forlate jorden må du ha en hastighet på 11,2 kilometer i sekundet, eller litt over 40.000 km/t om du vil. Det er ganske fort.[/COLOR]
Drit i dette(forrige avsnitt i rødt. Lar det stå..), jeg har misforstått.

"Escape velocity is sometimes misunderstood to be the speed a powered vehicle, such as a rocket, must reach to leave orbit and travel through outer space. The quoted escape velocity is commonly the escape velocity at a planet's surface, but it actually decreases with altitude. It is the speed above which an object will depart on a ballistic trajectory, i.e. in free-fall, and never fall back to the surface nor assume a closed orbit. Such an object is said to "escape" the gravity of the planet.

A vehicle with a propulsion system can continue to gain energy and travel away from the planet, in any direction, at a speed lower than escape velocity so long as it is under propulsion. If the vehicle's speed is below its current escape velocity and the propulsion is removed, the vehicle will assume a closed orbit or fall back to the surface. If its speed is at or above the escape velocity and the propulsion is removed, it has enough kinetic energy to "escape" and will neither orbit nor fall back to the surface."

Kilde: http://en.wikipedia.org/wiki/Escape_velocity