Originally posted by Smokersroom
if thats the case, then at what height do buildings start to have negative gravity, and being attracted away from the earth? Dont think youre right here.

We haven't built one that high yet, and there'd be some real problems in building one that high.

he's right, that's why space shuttles need a bigger rocket for launch. It's for being able to get out of the gravity pull of earth. think about what will happen to the planes if earth's gravity would only be effective at max 300 m. then try to think about everything else above 300 m.