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Question

A jet of water with cross section of 6 c m to the power of 2 end exponent strikes a wall at an angle of 60° to the normal and rebounds elastically from the wall without losing energy. If the velocity of the water in the jet is 12 m/s, the force acting on the wall is

  1. 0.864 Nt    
  2. 86.4 Nt    
  3. 72 Nt    
  4. 7.2 Nt    

The correct answer is: 86.4 Nt

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