Stopping the Juggernaut

According to Marvel lore when Cain Marko became the Juggernaut once he gained, not only vast strength, but unstoppable momentum. Once he starts to move in any direction he can't be stopped, at least theoretically that is. So, with that in mind what would happen if Juggernaut were to collide head on with a full head of steam with the following:

1.The Flash, full speed from the opposite direction?

2.Vibranium wall, 1 yd thick?

3.Superman, standing still braced for impact?

4.Mjolnir being swung full strength by Thor?

5.Superman, Full Speed from the opposite direction?

6.Superman, being given an additional boost by Flash, full speed from the opposite direction?

7.Superman sun dipped for 24 hrs, with the Flash's speed boost and Juggernaut being given an additional speed boost by Dr. Zoom?

Since Juggs have been stopped twice we can assume he can with sufficient power.

Any planetary force can do it. Think about it.

1) maybe

5) high possibility, there will be an explosion for sure