This is an interesting project, which came about as the result of a discussion between myself and David Lamhauge, via the forum.
The Pencil2D file is Non_Bounce-4.pclx (46.0 KB)
The guides which is used to position the reflection are coloured using a colour defined as ‘Invisable’ and they are visable when the Reflection layer and a defined frame is selected. To see them select the ball area using the tool.
The reflection was visable on my computer screen in the inital version, but was indistint on other screens, thus a second version was exported, as shown below!