ViewPropertyAnimator set absolute position

Question

I have an ImageView and I want to make an animation like this (sorry for bad image, but I think it give a general idea of animation)

I used ViewPropertyAnimator:

img.animate()
       .translationX(50f)
       .translationY(500f)
       .setDuration(500)
       .start();

And I get this:

Why that? Sorry for my bad English