Tell me more about the setup of the game. Is it a platformer? A physics game? How are you setting the speed of the ball in the first place?
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I'm glad it worked. I learned that myself through experience. Taught me to look for the simple things first. I call it the "is it plugged in rule.
Sometimes it can be the simple things. For the bullet behavior in the bullet properties is the "set angle" parameter set to True? If not then it should be.