If you calculate the amount of potential energy, mgh, to take you and your spacesuit up to a couple hundred miles, and then you accelerate yourself to 17,500 miles per hour -- remember, that one half MV squared -- and you figure it out.
Jeśli obliczymy energię, mgh, potrzebną by zabrać astronautkę kilkaset km i przyśpieszyć do 28000 km/h, pamiętacie, 1/2 mv2 - tak to obliczymy.