The Physics of The Hulk’s Jump
wired.com
wired.com
[1] (In my case, this is stolen from http://dx.doi.org/10.1016/j.apergo.2008.08.004 -- the blogger above tries to estimate his own feet but I have access through such paywalls. This surface area is given for one foot, but includes the top, so it's basically the same as two feet.)
There are many derivatives of 'Hulk'. The one depicted in this movie, and the most common hulk is Savage Hulk.
Savage Hulk's weight is estimated to be approximately 1,150lbs or roughly 520kg.[1]
[1] http://marvel.wikia.com/Hulk_(Robert_Bruce_Banner)
damn you for making me publicly reveal my obsession with a fictional character
It would be interesting to see it re-calculated with the accurate weight. His average height is also estimated at around 8 feet if that helps. No records exist to indicate his foot size however the do appear to be disproportionately large for his size.
The only surprising thing is that he goes from 0 to 120 mph in at most two meters of pushing (assuming he somehow ducks down to the point where his center of mass is only 2ft above the ground -- that makes this an upper limit). That means that he completes the jump in only about 75 milliseconds, or half of a human reaction time. You have to imagine that he ducks down, and then before you can blink, he is already off with full automobile speed flying into the air. The effect on the ground is basically the same as a car at 70 mph crashing into a concrete barrier; you can see a couple cars crashing into walls done by the Mythbusters at this link:
https://www.youtube.com/watch?v=r8E5dUnLmh4
The wall escapes pretty much unharmed, though I don't know what it's made out of.
The question posed is whether the concrete cracks, and it really depends on what's beneath the concrete. The problem is that concrete is basically made up of packed rocks held together with glue. This gives it an odd structural property: it is much easier to pull it apart, structurally speaking, than it is to compress it. Concrete does very well under compression, very poorly under tension. Bending a slab of concrete means putting compression on the near side, where the rocks have to come together, but putting tension on the far side, where stuff bends outward and apart. Whether the Hulk breaks the concrete depends very strongly on what's happening on the outward side -- does it generate cracks which propagate all the way up through the concrete? That's much harder to answer.
I do think that the most convincing explanation came from the comments section as well. The explanation is that:
"The Hulk's Mass and Power have no limit as he drives his power from Anger. Nobody can quantify Anger as their is no way to measure how angry one can get and there is no upper limit to Anger."
Makes sense to me!