def CalculateAcceleration(self):
currentTheta = math.atan(self.velocity[1]/self.velocity[0])
currentSquaredVelocity = math.pow(self.velocity[0],2)+math.pow(self.velocity[1],2)
accelerationMagnitude = currentSquaredVelocity*self.coeffD
self.acceleration = [math.cos(currentTheta)*accelerationMagnitude, math.sin(currentTheta)*accelerationMagnitude]
self.acceleration = [self.acceleration[0], self.acceleration[1]-self.g]
I believe this is where the problem is and it only happens when the the projectile is going to the right.
