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Don't forget that the asteroid picks up speed as it enters the earth's gravitational well. So add on an extra factor of the escape velocity (11km/s) to get 21km/s. Plug that into the calculator and you get a more spectacular 66MT impact.
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Don't forget that the asteroid picks up speed as it enters the earth's gravitational well. So add on an extra factor of the escape velocity (11km/s) to get 21km/s. Plug that into the calculator and you get a more spectacular 66MT impact.