As already noted, physics are just generic and, at moest, "average." The worst thing you will notice is the grenade; it bounces around like it has the weight and density of a small rubber ball.
Otherwise, you get fairly common problems: you can knock over a drum of oil/liquid/whatever without a problem, shooting a rocket directly into an enemy just makes it drop to the ground in death, you can topple moveable storage cabinets by just touching them, explosions have little to no impact, glass only breaks when convenient fro gameplay, etc.
It really just has the basic things: if there is a hanging body, you can hit it to make it sway a bit; sometimes enemies will fly up in the air on the death blow from a grenade, there are some small (no bigger than 12" cubed) boxes that you can move around by walking into them.
In all reality, you just will not notice that much. You character's body is not recognized very well (I can walk all over a soda can on a table and not budge it) and there is not much for you to physically ineract with in the levels. The game definitely has below Havoc-level physics (or just poorly implemented physics,) but you would never really notice a Havoc-based physics system due to the levels being so bare.
Noting you can work up a good bunny hop until you stamina goes out,
Ray
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