the propagation wave of the impact force would therefore travel a distance of 58.7 metres in a
time of 0.013 seconds. This means that during the time taken in the plastic shortening of the
impacted columns, the same force would be felt at a minimum distance of 58.7 metres, or
approximately 16 storeys, from the impact. These storeys would thus suffer an elastic deflection
in response to, and proportional to, the failure load applied at the impacted floor.
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