fall through solid objects

Hello,

please launch this .capx , wait 10 - 15 seconds (for ball to get faster) and tell me how is it possible that ball can fall through walls (in spite of the fact that they are solid)

anyone?

besides I would like to also know why that ball keeps gaining speed I want it to "fly" at speed 100, not 5000 ...

You've got acceleration set at 50, so the ball will constantly be getting faster, which it is. Flying through the solid can be explained because the drawing moves the ball by so many pixels per tick that it draws it on the other side of the wall in one tick, thereby missing the collision condition all together.

so in order to dont fall through that solid objects, you suggest to change the ball sprite or how to reduce that pixels ?

You said you wanted the speed at 100. Set acceleration to 0. Is that the result you actually want?