@rodolfog I wander, how you can notice this small things 
Regarding the brick, this is the latest edit https://forums.synfig.org/t/brick-fall-excercise-any-idea/14448/4?u=ahamd
The birck may rotate its weight & the remaining effect of its fall.
Regarding the ball, I had removed the squash as I thought that nobody will notice it 
and it gave the appearance of floating ball.