void krockEffekt(Ball otherball) {
            distance = Math.pow(position.x - otherball.position.x, 2) - Math.pow(position.y - otherball.position.y, 2);
            dx = position.x - otherball.position.x / distance;
            dy = position.y - otherball.position.y / distance;
            Coord d = new Coord(dx,dy);
            Coord normD = d.norm();


            impuls=Coord.scal(velocity,normD) - Coord.scal(otherball.velocity,normD);

            double New_velocityX1 = velocity.x - impuls*normD.x;
            double New_velocityY1 = velocity.y - impuls*normD.y;
            double New_velocityX2 = otherball.velocity.x + impuls*normD.x;
            double New_velocityY2 = otherball.velocity.y + impuls*normD.y;

            velocity = new Coord(New_velocityX1,New_velocityY1);
            otherball.velocity = new Coord(New_velocityX2,New_velocityY2);

    }