* Gravity: Gravity is the force of attraction between any two objects with mass. The Earth has a large mass, so it exerts a strong gravitational pull on objects near it.

* Acceleration due to Gravity: Objects falling towards the Earth experience a constant acceleration due to this gravitational force. This acceleration is approximately 9.8 m/s².

* Velocity: Velocity is a measure of both speed and direction. When an object falls towards the Earth, its velocity changes over time because gravity is constantly increasing its speed.

Why the wording needs correction:

* "Change velocity at a rate of 9.8m s" is not entirely accurate. 9.8 m/s² represents acceleration, not the change in velocity itself.

* "Due to which factor gravity" is grammatically awkward. It's better to say "due to gravity."

Correct statement:

"Objects change their velocity as they move towards Earth at a rate of 9.8 m/s², due to gravity."

Let me know if you have any other physics questions!