Implementing graviry in Scratch

In this small project we will create gravitational fall effect on different objects. Three objects are taken from the sprites library. The Apple will bounce if pressed "a" key. It is the heaviest object in this project. The Yellow colored ball bounces after pressing "b" key, it is lighter than the apple. And the purple colored baloon willl bounce if pressed "c" key. It is the lightest object in this project. You can see the coding done for this project in the project's homepage on MIT's website.