The speed force protects Flash from the negative effects of his speed, but if he's just running smack dab right into essentially an indestructible wall..I don't think it ends well for him.
If you're asking if the IMP can do anything to Juggy..I don't know. I am sure there are instances where Juggernaut has been KO'ed. So what did it take to accomplish that?
__________________ Chicken Boo, what's the matter with you? You don't act like the other chickens do. You wear a disguise to look like human guys, but you're not a man you're a Chicken Boo.
1. Who is they? You didn't list any characters (except maybe juggernaut).
Are you saying that if a character's ( who capable of doing an IMP) fist collided with Full speed (how fast is that?) Juggeranut's fist then who survives?
Be more detailed and specific. I definitely would love to answer the question, just need to understand first.