Thanks. The structure beside (from one of the tutorials) appears too puzzling and awkward to me and the following video has made things worse, I really don't understand anything of the woman's explanation:
Ball Bounce, MIT App Inventor Tutorial #3 - YouTube
When Ball1 is flung, set Ball1 speed to get heading? What number is get heading?
and at same time set Ball1 Heading to get heading? Speed is an action, I understand it, but as for Heading, setting it for heading? How come?
It is said to set speed to get speed, not get heading
In the designer it is given that speed=0 and heading=0. Get speed just gets that speed and Get heading gets that heading. You can also set them to any number of your choice.
Perhaps one of the following will provide a clearer explanation than your youtube link showing how to bounce a ball:
and
Here are some resources to help you learn to use the AI2 tools. A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook http://www.appinventor.org/book2 ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here Course In A Box and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .
Also look here App inventor español. Offline. Tutorial. Ejemplos. Instalación. Códigos. Juegos. Curso gratis de App inventor. and here Tutorial Index | Imagnity for more tutorials
Learn about components Component Reference
and visit the Library The MIT App Inventor Library: Documentation & Support Help>Library on the MENU
Thanks a million, I appreciate it.
Welcome 
!