Taimoor Khan
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That initial segment is intended to raise questions and you should follow the entire discussion through to the end where they answer such questions that were raised. Taking just an excerpt out of context is highly misleading. Again, the questions are an introduction to the theory of General Relativity, and not to negate gravity.
You need to go back to my original post, where I mentioned that theory of gravity as per newton in this day and age, with quantum physics or what not , is becoming controversial. Then you pop up start questioning if I have read my physics books in my ten grade or not. Yes ofcourse I know g=9.8m/s.
https://science.howstuffworks.com/environmental/earth/geophysics/question2322.htm
Albert Einstein, who won the Nobel Prize in Physics in 1921, contributed an alternate theory of gravity in the early 1900s. It was part of his famous General Theory of Relativity, and it offered a very different explanation from Newton's Law of Universal Gravitation. Einstein didn't believe gravity was a force at all; he said it was a distortion in the shape of space-time, otherwise known as "the fourth dimension" (see How Special Relativity Works to learn about space-time).
Its a completely different phenomena as per Einstein to the one you were referring to when you question that if I read my school books. As per above, the gravity that YOU were referring to simply do not exists.