A raw solution for ball speed problem

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#1

First I declare three variables, that will be maaximum and minimum velocity of the ball. They will be measured with an amplitude respecting the initial velocity.

[SerializeField] float amplitude = 2f;
float minVelocity;
float maxVelocity;

Then I initialize these variables just after ball is launched (in Update() method).

if(!hasStarted)
{
    LockBallToPaddle();
    LaunchOnMouseClick();
    minVelocity = myRigidbody2D.velocity.y - amplitude;
    maxVelocity = myRigidbody2D.velocity.y + amplitude;
}

Finally I create this methods for having a consistent velocity on the ball.

    private void OnCollisionExit2D(Collision2D collision)
    {
        CorrectXVelocity();
        CorrectYVelocity();
    }

   private void OnCollisionExit2D(Collision2D collision)
{
    CorrectXVelocity();
    CorrectYVelocity();
}

private void CorrectXVelocity()
{
    int xSign = Math.Sign(myRigidbody2D.velocity.x);
    float absXVelocity = Math.Abs(myRigidbody2D.velocity.x);

    if (absXVelocity < minVelocity)
    {
        myRigidbody2D.velocity += new Vector2((minVelocity - absXVelocity) * xSign, 0f);
    }

    if (absXVelocity > maxVelocity)
    {
        myRigidbody2D.velocity -= new Vector2((absXVelocity - maxVelocity) * xSign, 0f);
    }
}

private void CorrectYVelocity()
{
    int ySign = Math.Sign(myRigidbody2D.velocity.y);
    float absYVelocity = Math.Abs(myRigidbody2D.velocity.y);

    if (absYVelocity < minVelocity)
    {
        myRigidbody2D.velocity += new Vector2(0f, (minVelocity - absYVelocity) * ySign);
    }

    if (absYVelocity > maxVelocity)
    {
        myRigidbody2D.velocity -= new Vector2(0f, (absYVelocity - maxVelocity) * ySign);
    }
}

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