I am trying to add a dose of realism to a story I'm writing: imagine an invulnerable superman-like being that won't disintegrate at any point, weighing in at 349lbs, travelling at 86,000mph through the atmosphere and striking a rocky plain at that speed. How much energy would this release? Would this be comparable to a nuclear strike?
I tried to do my homework by using this tool (http://www.purdue.edu/impactearth/), but it doesn't allow me to put in the desired impact speed, assumes a meteor that small would break apart and so forth. Any help would be appreciated.