I felt vaguely motivated to google the topic, and I read the first promising link I came across. I have to say, watching geeks try to rationalise the physics is hilarious.
I found a long post trying to discuss it in reference to Newton's Third Law, tried to work out how much impact was absorbed versus reflected, and showed only a couple of glimmers of self awareness.
"Obviously, a bit of hand-waving is needed here, ..."
Ha ha ha, no really?
"... it's also important to keep in mind that applying real-world physics to a comic book will almost always result in frustration."
That's not going to stop anyone. Well, obviously.