columns did not have their own foundations and the truss (they were sitting on as was the case with WTC7) was knocked out, there would be no real vertical force that could resist the inertia of the fall. Keep in mind that the fall speed due to gravity does not depend on the mass of the falling object, but inertia does.
Paraphrazing: in a vacuum, a feather and a huge steel ball will travel at the same speed (acceleration to be precise) down due to gravity and reach the ground at the same time. But it would be difficult to slow the movement of the ball if you wanted to.
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