Question

Explain what is acceleration due to gravity.

Answer 1

Acceleration is caused by a net force acting on an object. On Earth, the force of gravity pulls down any object that has a mass. This produces an acceleration towards the center of the Earth, which is known as acceleration due to gravity.
$F=ma\Rightarrow \frac{GMm}{r^2}=ma$
$\Rightarrow a=\frac{GM}{r^2}$
Near the surface of the earth, its value comes to be 9.8 $m/s^2$.