84. Let mbe the mass of the higher floors. By energy conservation, the speed of the higher floors just before impact is 212.2mgdmvvgd=¡=The magnitude of the impulse during the impact is 22||2ddJpmvmvmgdmgWgg=Δ =Δ ====whereWmg=represents the weight of the higher floors. Thus, the average force exerted
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