import Vector

class Ball:
    radius: float
    color: str

    position: Vector.Vector
    velocity: Vector.Vector
    acceleration: Vector.Vector

    def __init__(self, radius, color,position, velocity, acceleration):
        self.radius = radius
        self.color = color
        self.position = position
        self.velocity = velocity
        self.acceleration = acceleration

    def update():
        velocity = velocity.add(acceleration)
        position = position.add(velocity)

    

The problem I'm having is that the acceleration in the update function is registering that acceleration is a state variable, and it is saying it is not defined