can i use it

One of my friends was about to throw this lens away as he no longer has a camera.( Pentax-A Zoom 1:3.5~4.5. 28~80mm). My question is, can i use it on my Pentax Kx with an adapter. And is there an adapter on the market. I have a feeling this came of off a film camera. So i may be wasting my time. Your thoughts please.

Please don't post the same question in more than one place.

I'll close this one.