Question

How did 9.8ms-2 came

Answer 1

It is the value for g (acceleration due to gravity)

Answer 2

hy

its acceleration due to gravity(g)

the acceleration produced  when earth attracts object towards itself

why we doesnot see earth falling ? as we know that eart has alot mass and acc to newton second law acceleration will be less so acceleration produced is so less that its effect cannot be seen by our eyes it can only be observed and after observing its acceleration was 9.8 m per second square

______hope helped_