What happens to the ball's speed when it hits the left wall in the programs?

When the ball hits the left wall in the programs, the direction of the ball reverses. This occurs because, in many graphical programming environments, collisions with walls result in the object reflecting off the surface it collides with. When the ball strikes the left wall, instead of continuing in the same direction, it bounces back in the opposite direction, maintaining its speed but changing its motion.

This phenomenon is commonly used in game design and animations to create realistic interactions between objects and boundaries. The other options may imply changes to the ball's speed or status, such as stopping or doubling its speed, which do not accurately describe the behavior typically programmed for such collisions.