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A pressure-pump has a horizontal tube of cross sectional area 10 cm 2 for the outflow of water at a speed of 20 m/s. The force exerted on the vertical wall just in front of the tube which stops water horizontally flowing out of the tube, is [given: density of water = 1000 kg/m 3 ]

1. 300 N
2. 500 N
3. 250 N
4. 400 N

Correct answer: 400 N

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