How does inheritance operate when using the object of the classes?

- The inheritance needs a parent and a child class where the child class inherits the property of the parent class. Child can have their own functions or inherit functions and properties from the parent class. 

TFootball child class is the base class and inheriting the properties of TBall class of the parents. 

For Ex.

var
beachBall : TBall;
soccerBall : TFootball;
begin
beachBall := TBall.Create(5);
soccerBall := TFootball.Create(5, 12);

beachBall.Kick(10);
soccerBall.Kick(10);

ShowMessageFmt('Beach ball is moving at speed : %d',[beachBall.GetSpeed]);
ShowMessageFmt('Soccer ball is moving at speed : %d',[soccerBall.GetSpeed]);
end;

The output is shown as such:
Beach ball is moving at speed: 12
Soccer ball is moving at speed: 12