As shown in figure 1-3- 1 1, there is a plastic rectangular template ABCD, which is 10cm long and 4cm wide. Place the right-angle vertex P of the right-angle triangle PHF in your hand on the edge of AD (not coincident with A and D), and move the triangle vertex P to AD appropriately:

① Can you make the two right angles of your triangle pass through point B and point C respectively? If possible, please find out the length of AP at this time; If not, please explain why.

② Move the position of the triangle again, so that the vertex P of the triangle moves on AD. The right-angle side PH always passes through point B, and the other right-angle side PF intersects with the extension line of DC at point Q, and intersects with BC at point E. Is it OK for CE=2cm? If possible, please find out the length of AP at this time; If not, please explain why.