What happens if I hit a police car through no fault of my own?

I had the right-of-way in a two-way stop (i.e. my street had no stop) and was about to go through the intersection, when a cop decided he didn't need to acknowledge the stop sign on his street and came speeding through. He applied brake only when he was smack in middle of the intersection, after realizing my car was inches from T-boning his. He looked at me for a moment, then sped on. I did not hit him, but what if I had? I was driving carefully at the proper speed limit. Would there have been any penalty to me for hitting his car?