Parabola y=(k/8)(x+2)(x-4)(k is constant and k >;; 0) From left to right, it intersects with X axis at points A and B, and intersects with X axis at point C. The straight line passing through point B is y=- root sign for three times, and the other intersection of x/3+b and parabola is d. 。
(2) If there is a point P on the parabola of the first quadrant, make the triangle with vertices A, B and P similar to triangle ABC, and find the value of k;
(3) Under the condition of (1), let f be a point on the straight line BD (excluding the end point) and connect AF. The moving point M starts from point A, moves along the line AF to F at a speed of 1 unit per second, and then moves along the line FD to point D at a speed of 2 units per second. What are the coordinates of point F?