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?
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.
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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.