I know this question might seem a bit vague so I hope to clarify here.
Say, an individual, or group of individuals, is tasked to kill several superheroes/villains with superhuman physical characteristics. What weapons/ammo would they use to kill them with minimal collateral damage and minimal non-combatant casualties?
(These tools can be fictional or currently existing but they must not be "magical". Think more Gears of War/Mass Effect instead of Skyrim/Dragon age. Please detail the function and ammunition of the weapon.)
Target 1- Strength/Durability 10x average adult male. (can lift 3/4 short ton over head = 1,550 lbs)
Target 2- Strength/Durability 50x average adult male. (can lift near 4 tons over head = 7,750 lbs)
Target 3- Strength/Durability 500x average adult male. (can lift near 40 tons over head = 77,500 lbs)
Target 4- Strength/Durability 5000x average adult male. (can lift near 400 tons = 775,000 lbs)
Target 5- Strength/Durability 50000x average adult male. (can lift near 4000 tons = 7,750,000 lbs)
Edit: As I was asked to quantify what exactly I meant by durability, I will. Logically, characters capable of physically achieving a certain degree of energy output, must be able to at least withstand a comparable amount of damage, or their bodies would break apart from the strain and automatic counterforce, whenever they exert themselves.
As such, assume Target 1 possesses skin with the durability of well-treated leather and while a gunshot from a 9mm would bruise, it would not penetrate the skin. Simply scale up from there.
In addition, assume that as the potency of their superhuman characterisitics increase, their vulnerability to certain other weaknesses would lessen as well. This would include mundane poison, blunt force trauma and radiation. Fall damage would be less of a problem, considering their bodies are already ignoring physics in the sense that their radical strength doesn't already tear them apart.