Energy = Mass X Velocity^2 (that means squared)
Take a big rock traveling at 20,000 mph
20,000 X 20,000 X rock_mass = you don’t wanna be where the rock hits!
Total energy released can be a lot more than most nuclear weapons, depending of course on the speed and size of the rock.
The dinosaur killer makes the largest nuke ever tested look like nothing much to mention.
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