Newton's First Law of Motion:
Objects tend to "keep on doing what they're doing" (unless acted upon by an unbalanced force).
Newton's Third Law of Motion:
For every action, there is an equal and opposite reaction.
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How could two large wide-bodied aluminum jetliners penetrate massive steel towers and disappear with no deceleration visible, no plane wreckage visible in gashes and none knocked to the ground below the impact zone?
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