(b] From equation (3) 



36 



UJ, = U - T r- = 36 



>-> ant + 1 



Ttut + 1 (0.0076 X 36 X 2.4) + 1 



u^, = 14.3 feet (4.35 meters) per second . 

 From equation (4) 



F = pVa (u - u^j)^ 



F = 2 X 6,048 X 0.007^ (36 - 14. 3)^ 



F = 4.3 X io'+ pounds (1.9 x iqS newtons) 

 (c) Momentum, M^, at impact is 



Mq = u^ X mass 



taking the mass of the building equal to the mass of the displaced 

 water for a partially submerged building which is floating (the mass 

 includes water within the building) , 



mass = pV = 2 X 6,048 = 12,096 pounds-second squared per foot 

 and the momentum is 



Mq = U2, X mass = 14.3 x 12,096 



Mq = 1.7 X 10^ pounds-seconds (7.7 x lo^ newton- seconds) 

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